Showing posts with label This and That. Show all posts
Showing posts with label This and That. Show all posts

Tuesday, April 28, 2009

Global Warming ?

Global warming is a term used to describe a gradual increase in the earth’s average ground and atmospheric temperatures across the whole planet. Measurements indicate that the global temperature has increased by about 1 degree Fahrenheit in the past century.

This warming trend appeared during a period when human activities were beginning to increase the carbon dioxide (CO2) and other greenhouse gases in the atmosphere.

Although most scientists believe that a rise in carbon dioxide emissions will lead to further global warming, uncertainties remain about the timing and severity of resulting climatic change. Nevertheless, many are convinced that human activities are partly responsible for the long-term warming of the past century and that climatic changes caused by greenhouse gas increases will be a continuing part of our future.

They believe there is enough evidence to warrant a sensible approach toward minimizing the potential consequences of global warming. The Intergovernmental Panel on Climate Change, a panel of 2,000 scientists convened by the United Nations’ Environment Programme and the World Meteorological Organization, determined that even if we take steps now to reduce our emissions of greenhouse gases, the globe could warm up at a rate faster than it has in the past
10,000 years.

What is the Difference Between Global Warming and the Ozone Hole?
It is important to note that global warming is a separate problem from ozone depletion. Ozone depletion refers to the thinning of the ozone layer in the stratosphere, which extends roughly between 9-31 miles above the earth’s surface. A diminished ozone layer allows more harmful radiation to reach the earth’s surface. Global warming, on the other hand, refers to an increase in the earth’s average temperature.

The Greenhouse Effect, Climate Change, and Global Warming

The Greenhouse Effect: Scientists are certain about the greenhouse effect. They know that greenhouse gases make the earth warmer by trapping heat in the atmosphere.

Climate Change: Climate is the long-term average of a region’s weather events lumped together. For example, it’s possible that a winter day in Buffalo, New York, could be sunny and mild, but the average weather—the climate—tells us that Buffalo’s winters will mainly be cold and include snow and rain. Climate change represents a change in these long-term weather patterns. They can become warmer or colder; annual amounts of rainfall or snowfall can increase or decrease.

Global Warming: Global warming refers to an average increase in the earth’s temperature,
which in turn causes changes in climate. A warmer earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, one of their concerns is about rapid global warming caused by human activities.


The Maldives is one of the lowest lying countries in the world and is threatened by sea level rise and other climate change impacts like increased sea temperatures. It was the first country to sign the Kyoto protocol in 1997 and is closely following the climate negotiations in Poznan, Poland.

NOAA/NASA/EPA CLIMATE CHANGE PARTNERSHIP

Documentary video about The Maldives http://www.youtube.com/watch?v=3IC9uoyF-2s

What you need to know about swine flu

Khmer Intellectuals ( Swine Flu): A never-before-seen strain of swine flu has turned killer in Mexico and is causing milder illness in the United States and elsewhere. While authorities say it's not time to panic, they are taking steps to stem the spread and also urging people to pay close attention to the latest health warnings and take their own precautions.

"Individuals have a key role to play," Dr. Richard Besser, acting chief of the Centers for Disease Control and Prevention, said Monday.

Here's what you need to know:

Q: How do I protect myself and my family?
A: For now, take commonsense precautions. Cover your coughs and sneezes, with a tissue that you throw away or by sneezing into your elbow rather than your hand. Wash hands frequently; if soap and water aren't available, hand gels can substitute. Stay home if you're sick and keep children home from school if they are.

Q: How easy is it to catch this virus?
A: Scientists don't yet know if it takes fairly close or prolonged contact with someone who's sick, or if it's more easily spread. But in general, flu viruses spread through uncovered coughs and sneezes or — and this is important — by touching your mouth or nose with unwashed hands. Flu viruses can live on surfaces for several hours, like a doorknob just touched by someone who sneezed into his hand.

Q: In Mexico, officials are handing out face masks. Do I need one?
A: The CDC says there's not good evidence that masks really help outside of health care settings. It's safer just to avoid close contact with someone who's sick and avoid crowded gatherings in places where swine flu is known to be spreading. But if you can't do that, CDC guidelines say it's OK to consider a mask — just don't let it substitute for good precautions.

Q: Is swine flu treatable?
A: Yes, with the flu drugs Tamiflu or Relenza, but not with two older flu medications.

Q: Is there enough?
A: Yes. The federal government has stockpiled enough of the drugs to treat 50 million people, and many states have additional stocks. As a precaution, the CDC has shipped a quarter of that supply to the states to keep on hand just in case the virus starts spreading more than it has so far.

Q: Should I take Tamiflu as a precaution if I'm not sick yet?
A: No. "What are you going to do with it, use it when you get a sniffle?" asks Dr. Marc Siegel of New York University Langone Medical Center and author of "Bird Flu: Everything you Need To Know About The Next Pandemic." Overusing antiviral drugs can help germs become resistant to them.

Q: How big is my risk?
A: For most people, very low. Outside of Mexico, so far clusters of illnesses seem related to Mexican travel. New York City's cluster, for instance, consists of students and family members at one school where some students came back ill from spring break in Mexico.

Q: Why are people dying in Mexico and not here?
A: That's a mystery. First, understand that no one really knows just how many people in Mexico are dying of this flu strain, or how many have it. Only a fraction of the suspected deaths have been tested and confirmed as swine flu, and some initially suspected cases were caused by something else.

Q: Should I cancel my planned trip to Mexico?
A: The U.S. did issue a travel advisory Monday discouraging nonessential travel there.

Q: What else is the U.S., or anyone else, doing to try to stop this virus?
A: The U.S. is beginning limited screening of travelers from Mexico, so that the obviously sick can be sent for treatment. Other governments have issued their own travel warnings and restrictions. Mexico is taking the biggest steps, closings that limit most crowded gatherings. In the U.S., communities with clusters of illness also may limit contact — New York closed the affected school for a few days, for example — so stay tuned to hear if your area eventually is affected.

Q: What are the symptoms?
A: They're similar to regular human flu — a fever, cough, sore throat, body aches, headache, chills and fatigue. Some people also have diarrhea and vomiting.

Q: How do I know if I should see a doctor? Maybe my symptoms are from something else — like pollen?
A: Health authorities say if you live in places where swine flu cases have been confirmed, or you recently traveled to Mexico, and you have flulike symptoms, ask your doctor if you need treatment or to be tested. Allergies won't cause a fever. And run-of-the-mill stomach bugs won't be accompanied by respiratory symptoms, notes Dr. Wayne Reynolds of Newport News, Va., spokesman for the American Academy of Family Physicians.

Q: Is there a vaccine to prevent this new infection?
A: No. And CDC's initial testing suggests that last winter's flu shot didn't offer any cross-protection.

Q: How long would it take to produce a vaccine?
A: A few months. The CDC has created what's called "seed stock" of the new virus that manufacturers would need to start production. But the government hasn't yet decided if the outbreak is bad enough to order that.

Q: What is swine flu?
A: Pigs spread their own strains of influenza and every so often people catch one, usually after contact with the animals. This new strain is a mix of pig viruses with some human and bird viruses. Unlike more typical swine flu, it is spreading person-to-person. A 1976 outbreak of another unusual swine flu at Fort Dix, N.J., prompted a problematic mass vaccination campaign, but that time the flu fizzled out.

Q: So is it safe to eat pork?
A: Yes. Swine influenza viruses don't spread through food.

Q: And whatever happened to bird flu? Wasn't that supposed to be the next pandemic?
A: Specialists have long warned that the issue is a never-before-seen strain that people have little if any natural immunity to, regardless of whether it seems to originate from a bird or a pig. Bird flu hasn't gone away; scientists are tracking it, too.


California Governor Arnold Schwarzenegger speaks at a press conference on the swine flu situation in Beverly Hills. Four more cases of swine flu were confirmed across California on Monday as officials launched an emergency action plan to tackle the outbreak believed to have killed 149 people in Mexico.(AFP/Robyn Beck)




South Korean quarantine officers try to take saliva samples of a baby arriving from the US at Incheon airport, west of Seoul on April 28, 2009. World governments and businesses announced new steps on Tuesday to try to slow the spread of a new strain of swine flu that has killed up to 149 people in Mexico and threatens to become a pandemic. REUTERS/Jung Yeon-je/Pool (SOUTH KOREA HEALTH TRANSPORT TRAVEL IMAGES OF THE DAY)




An Egyptian boy plays next to pigs near a private farm in Cairo, Egypt, Tuesday, April 28, 2009. Egyptian health authorities are examining about 350,000 pigs being raised in Cairo and other provinces for swine flu.(AP Photo/Nasser Nouri)




A Thai veterinarian swabs a pig's snout to collect samples for a swine flu test at the enclosure of a pig farm in Ratchaburi province, 135 km (84 miles), west of Bangkok April 28, 2009. The United Nations' food agency said on Tuesday its was mobilising its animal health experts to check if the new strain of flu virus widely described as swine flu is really directly linked to pigs.REUTERS/Chaiwat Subprasom

By LAURAN NEERGAARD, AP Medical Writer
U.S. government flu info: http://pandemicflu.gov/faq/swineflu/

Swine flu spreads to Middle East, Asia-Pacific

MEXICO CITY – The swine flu epidemic crossed new borders Tuesday with the first cases confirmed in the Middle East and the Asia-Pacific region, as the number of deaths in Mexico blamed on the virus surpassed 150.

A statue wearing masks on Reforma Avenue in Mexico City. The global swine flu crisis, which has so far killed more than 150 people in Mexico, is deepening with at least 16 countries in Europe and Asia reporting confirmed or suspected infections.(AFP/Alfredo Estrella
With the swine flu having already spread to at least six other countries besides Mexico, authorities around the globe are like firefighters battling a blaze without knowing how far it extends.
"At this time, containment is not a feasible option," said Keiji Fukuda, assistant director-general of the World Health Organization, which raised its alert level on Monday.

New Zealand reported Tuesday that 11 people who recently returned from Mexico contracted the virus. Tests conducted at a World Health Organization laboratory in Australia had confirmed three cases of swine flu among 11 members of the group who were showing symptoms, New Zealand Health Minister Tony Ryall said.

Officials decided that was evidence enough to assume the whole group was infected, he said.
Those infected had suffered only "mild illness" and were expected to recover, Public Health Director Mark Jacobs said. There are 43 more suspected cases in the country, officials said.

The Israeli Health Ministry on Tuesday confirmed the region's first case of swine flu in the city of Netanya. The 26-year-old patient recently returned from Mexico and had contracted the same strain, Health Ministry spokeswoman Einav Shimron.

Dr. Avinoam Skolnik, Laniado Hospital's medical director, said the patient has fully recovered and is in "excellent condition" but will remain hospitalized until the Health Ministry approves his release.

Another suspected case has been tested at another Israeli hospital but results are not in, the ministry said.

Meanwhile, a second case was confirmed Tuesday in Spain, Health Minister Trinidad Jimenez said, a day after the country reported its first case. The 23-year-old student, one of 26 patients under observation, was not in serious condition, Jimenez said.

With the virus spreading, the U.S. prepared for the worst even as President Barack Obama tried to reassure Americans.

At the White House, a swine flu update was added to Obama's daily intelligence briefing. Obama said the outbreak is "not a cause for alarm," even as the U.S. stepped up checks of people entering the country and warned U.S. citizens to avoid nonessential travel to Mexico.

"We are proceeding as if we are preparatory to a full pandemic," said Homeland Security Secretary Janet Napolitano.

The European Union health commissioner suggested that Europeans avoid nonessential travel both to Mexico and parts of the United States. Russia, Hong Kong and Taiwan said they would quarantine visitors showing symptoms of the virus.

Mexico, where the number of deaths believed caused by swine flu rose by 50 percent on Monday to 152, is suspected to be ground zero of the outbreak. But Mexican Health Secretary Jose Angel Cordova late Monday said no one knows where the outbreak began, and implied it may have started in the U.S.

"I think it is very risky to say, or want to say, what the point of origin or dissemination of it is, given that there had already been cases reported in southern California and Texas," Cordova told a press conference.

It's still not clear when the first case occurred, making it impossible thus far to determine where the breakout started.

Dr. Nancy Cox of the Atlanta-based Centers for Disease Control and Prevention has said she believes the earliest onset of swine flu in the United States happened on March 28. Cordova said a sample taken from a 4-year-old boy in Mexico's Veracruz state in early April tested positive for swine flu. However, it is not known when the boy, who later recovered, became infected.

The World Health Organization raised the alert level to Phase 4, meaning there is sustained human-to-human transmission of the virus causing outbreaks in at least one country. Monday was the first time it has ever been raised above Phase 3.

Putting an alert at Phases 4 or 5 signals that the virus is becoming increasingly adept at spreading among humans. Phase 6 is for a full-blown pandemic, characterized by outbreaks in at least two regions of the world.

Fifty cases — none fatal and most of them mild — were confirmed in the United States. Including the New Zealand, Israeli and new Spanish reports, there were 92 confirmed cases worldwide on Tuesday. That included six in Canada, one in Spain and two in Scotland.

Symptoms include a fever of more than 100, coughing, joint aches, severe headache and, in some cases, vomiting and diarrhea.

Amid the alarm, there was a spot of good news. The number of new cases reported by Mexico's largest government hospitals has been declining the past three days, Cordova said, from 141 on Saturday to 119 on Sunday and 110 Monday.

In a bid to prevent mass contagion, Mexico canceled school nationwide until May 6, and the Mexico City government is considering a complete shutdown, including all public transportation. The Cinco de Mayo parade celebrating Mexico's defeat of a French army on May 5, 1862 and Mexico City's traditional May 1 parade were canceled. More than 100 museums nationwide were closed.

At Mexico City's international airport, families grimly waited for flights out of the capital or country, determined to keep their masks on until they touched ground somewhere else.

Three games involving Mexico City soccer clubs were played with no spectators over the weekend. Decio de Maria, secretary general of the Mexican soccer federation, said plans for future matches would be announced on Wednesday.

"The idea is to look for the fewest number of games that have to be played behind closed doors," he said. "If it's necessary, we'll play all the matches behind closed doors. We don't foresee canceling any games."

Many residents of Mexico City wore blue surgical masks, though the CDC said most masks offer little protection. Many victims have been in their 30s and 40s — not the very old or young who typically succumb to the flu. So far, no deaths from the new virus have been reported outside Mexico.

It could take four to six months before the first batch of vaccines are available, WHO officials said. Some antiflu drugs do work once someone is sick.

Napolitano, the U.S. Homeland Security chief, said Washington is dispatching people and equipment to affected areas and stepping up information-sharing at all levels of government and with other nations.

Richard Besser, the CDC's acting director, said his agency is aggressively looking for evidence of the disease spreading and probing for ways to control and prevent it.

Flu deaths are nothing new in the United States. The CDC estimates that about 36,000 people died of flu-related causes each year, on average, during the 1990s in the United States. But the new flu strain is a combination of pig, bird and human viruses that humans may have no natural immunity to.

Besser said that so far the virus in the United States seems less severe than in Mexico. Only one person has been hospitalized in the U.S.

"I wouldn't be overly reassured by that," Besser told reporters at CDC headquarters in Atlanta, sounding a cautionary note.

The best way to keep the disease from spreading, Besser said, is by taking everyday precautions such as frequent handwashing, covering up coughs and sneezes, and staying away from work or school if not feeling well.

WHO spokesman Peter Cordingley singled out air travel as an easy way the virus could spread, noting that the WHO estimates that up to 500,000 people are on planes at any time.

Governments in Asia — with memories of previous flu outbreaks — were especially cautious. Singapore, Thailand, Japan, Indonesia and the Philippines dusted off thermal scanners used in the 2003 SARS crisis and were checking for signs of fever among passengers from North America. South Korea, India and Indonesia also announced screening.

Teams of doctors, nurses and government officials boarded flights arriving in Japan from Mexico, the U.S. and Canada to check passengers for signs of the flu, Japanese Health Ministry official Akimori Mizuguchi said.

World stock markets fell Tuesday as investors worried that any swine flu pandemic could derail a global economic recovery.

By AP writers Mark Stevenson in Mexico City, Mike Stobbe in Atlanta, Ray Lilley in Wellington, New Zealand, Aron Heller in Jerusalem and Pan Pylas in London contributed to this report.

Monday, April 27, 2009

Swine Flu: 5 Things You Need to Know About the Outbreak

Concern that the world could be on the brink of the first influenza pandemic in more than 40 years escalated Sunday as France, Hong Kong, New Zealand and Spain reported potential new cases in which people had been infected with swine flu and Canada confirmed several new cases. In the U.S., where 20 such infections have been confirmed, federal health officials declared a public-health emergency and are preparing to distribute to state and local agenciesa quarter of the country's 50 million-dose stockpile of antiviral drugs. Meanwhile, in hard-hit Mexico, where more than 80 people have died from what is believed to be swine flu, the government closed all public schools and canceled hundreds of public events in Mexico City.

Though the World Health Organization (WHO) is referring to the situation as a "public-health emergency of international concern," the apparent emergence in several countries of an entirely new strain of H1N1 flu virus has led some scientists to believe that it is only a matter of time before the WHO declares pandemic status, a move that could prompt travel bans to infected countries. "We are clearly seeing wide spread," says Michael Osterholm, a pandemic risk expert who runs the University of Minnesota's Center for Infectious Disease Research and Policy.

Health officials in Washington were quick to point out Sunday that none of the 20 cases identified in the U.S. so far has been fatal; all but one of the victims has recovered without needing to be hospitalized. Officials also noted that only one American has been infected so far who had not recently traveled to Mexico - a woman in Kansas got sick after her husband returned from a business trip in that country, where he became ill - but that could change as more intensive disease surveillance begins. "As we continue to look for more cases, I expect we're going to find them," said acting Centers for Disease Control (CDC) director Richard Besser.

In the U.S., where cases have also been found in California, Texas, and New York City, the declaration of a public-health emergency is part of what federal officials termed an "aggressive response" to the outbreaks. In addition to releasing from the national stockpile some 12.5 million doses of the antiviral drugs Tamiflu and Relenza - which scientists say has so far been effective against the H1N1 swine flu virus - the Department of Homeland Security will begin "passive surveillance" to screen people entering the U.S. Any traveler coming from a country with a confirmed human swine flu infection will be questioned, checked for symptoms and potentially isolated if they are found ill. Though the CDC has issued public warnings about the more serious outbreak in Mexico, there are no recommendations from Washington against traveling to the neighboring country.

That is in contrast to the more extreme actions of some other governments, including Hong Kong, where officials on Sunday urged residents to avoid going to Mexico. Hong Kong officials also ordered the immediate detention in a hospital of anyone who arrives with a fever above 100.4 F, respiratory symptoms and a history of traveling over the past seven days to a city with a confirmed case of swine flu infection.

But Washington officials Sunday did their best not to overstate the situation and emphasized that their response wasn't out of the ordinary. "I wish we could call it declaration of emergency preparedness, because that's really what it is in this context," said Secretary of Homeland Security Janet Napolitano. "We're preparing in an environment where we really don't know ultimately what the size or seriousness of this outbreak is going to be."

1. Is this a flu pandemic?
The influenza virus is constantly mutating. That's why we can't get full immunity to the flu, the way we can to diseases like chicken pox, because there are multiple strains of the flu virus and they change from year to year. However, even though the virus makes us sick, our immune systems can usually muster enough of a response so that the flu is rarely fatal for healthy people.

But every once in awhile, the virus shifts its genetic structure so much that our immune systems offer no protection whatsoever. (This usually happens when a flu virus found in animals - like the avian flu still circulating in Asia - swaps genes with other viruses in a process called reassortment, and jumps to human beings.) A flu pandemic occurs when a new flu virus emerges for which humans have little or no immunity and then spreads easily from person to person around the world. In the 20th century we had two mild flu pandemics, in 1968 and 1957, and the severe "Spanish flu" pandemic of 1918, which killed an estimated 40 to 50 million people worldwide.

The WHO has the responsibility of declaring when a new flu pandemic is underway, and to simplify the process, the U.N. body has established six pandemic phases. Thanks to H5N1 avian flu, which has killed 257 people since 2003 but doesn't spread very well from one human to another, we're currently at phase 3. If the WHO upgraded that status to phase 4, which is marked by a new virus that begins to pass easily enough from person to person that we can detect community-sized outbreaks, such a move would effectively mean that we've got a pandemic on our hands.

The H1N1 swine flu virus has already been identified as a new virus, with genes from human and avian flus as well as the swine variety. And since it is apparently causing large-scale outbreaks in Mexico, along with separate confirmed cases in the U.S. and Canada and suspected cases in other countries, it would seem that we've already met the criteria for phase 4. But though an emergency committee met on April 25 to evaluate the situation, the WHO hasn't made the pandemic declaration yet. Keiji Fukuda, the WHO's interim assistant director-general for health, security and environment, said on Sunday that its experts "would like a little bit more information and a little bit more time to consider this." The committee is set to meet again by April 28 at the latest.

As health officials have repeatedly emphasized, with good reason, the swine flu situation is evolving rapidly, and more lab tests are needed to ascertain exactly what is going on in Mexico and elsewhere. "We want to make sure we're on solid ground," said Fukuda, a highly respected former CDC official and flu expert.

2. What will happen if this outbreak gets classified as a pandemic?
Moving the world to pandemic phase 4 would be the signal for serious containment actions to be taken on the national and international level. Given that these actions would have major implications for the global economy, not to mention the effects of the public fear that would ensue, there is concern that the WHO may be considering politics along with science. "What the WHO did makes no sense," says Osterholm. "In a potential pandemic, you need to have the WHO be beyond question, and (April 25) was not a good day for them."

Of course, declaring a pandemic isn't a decision that should be taken lightly. For the WHO, phase 4 might trigger an attempt to keep the virus from spreading by instituting strict quarantines and blanketing infected areas with antivirals. But we appear to have missed the opportunity to contain the disease at its source since the virus is already crossing borders with ease. "We cannot stop this at the border," said Anne Schuchat, the CDC's interim director for science and public health. "We don't think that we can quench this in Mexico if it's in many communities now."

That would leave the WHO and individual countries to fall back on damage control, using antivirals and old-fashioned infection control - like closing schools, limiting public gatherings and even restricting travel - to slow the spread of the virus. But such efforts would likely inflict serious damage on an already faltering global economy - and the truth is, we don't know how well those methods will work.

3. Why have the U.S. cases been so much milder than the ones in Mexico?
This is the question that has health officials from Geneva to Washington puzzled. In Mexico, swine flu has caused severe respiratory disease in a number of patients - and even more worryingly, has killed the sort of young and healthy people who can normally shrug off the flu. (Fueling such concerns is the fact that similar age groups died in unusually high numbers during the 1918 pandemic.) Yet the cases in the U.S. have all been mild and likely wouldn't have even garnered much attention if doctors hadn't begun actively looking for swine flu in recent days. "What we're seeing in this country so far is not anywhere near the severity of what we're hearing about in Mexico," said the CDC's Besser. "We need to understand that."

Some of the difference may be due to the fact that Mexico has apparently been grappling with swine flu for weeks longer than the U.S. As doctors across the U.S. begin checking patients with respiratory symptoms for swine flu, CDC officials expect to see more severe cases in the U.S. as well - and as better epidemiological work is done in Mexico, we'll probably hear about more mild cases there too. Right now, however, the true severity of the H1N1 swine flu virus is still an open question, whose answer could change over time. The 1918 Spanish flu pandemic began with a fairly mild wave of infections in the spring, but the virus returned a few months later in a far more virulent form. That could happen with the current swine flu as well. "It's quite possible for this virus to evolve," said Fukuda. "When viruses evolve, clearly they can become more dangerous to people."

4. How ready is the U.S. - and the world - to respond to a flu pandemic?
In some ways, the world is better prepared for a flu pandemic today than it has ever been. Thanks to concerns over H5N1 avian flu, the WHO, the U.S. and countries around the world have stockpiled millions of doses of antivirals that can help fight swine flu as well as other strains of influenza. The U.S. has a detailed pandemic preparation plan that was drafted under former President George W. Bush. Many other countries have similar plans. SARS and bird flu have given international health officials useful practice runs for dealing with a real pandemic. We can identify new viruses faster than ever before, and we have life-saving technologies - like artificial respirators and antivirals - that weren't available back in 1918. "I believe that the world is much, much better prepared than we have ever been for dealing with this kind of situation," said Fukuda.

At the same time, the very nature of globalization puts us at greater risk. International air travel means that infections can spread very quickly. And while the WHO can prepare a new swine flu vaccine strain in fairly short order, we still use a laborious, decades-old process to manufacture vaccines, meaning it would take months before the pharmaceutical industry could produce its full capacity of doses - and even then, there wouldn't be enough for everyone on the planet. The U.S. could be particularly vulnerable; only one plant, in Stillwater, Penn., makes flu vaccine in America. In a pandemic, that could produce some ugly political debates. "Do you really think the E.U. is going to release pandemic vaccine to the U.S. when its own people need it?" asks Osterholm.

5. So how scared should we be?
That depends on whom you ask. Officials at the CDC and the WHO have emphasized that while the swine flu situation is serious, they're responding with an abundance of precautions. Even Osterholm, who has been highly critical of the U.S. government's long-term failures to better prepare for a pandemic, gives the CDC a 9 out of 10 for its response so far. Outside of Mexico, the swine flu hasn't looked too serious yet - unlike during the SARS outbreaks of 2003, when an entirely new virus with no obvious treatment took the world by surprise. In the U.S., the normal flu season is winding down, which should make it easier for public-health officials to pick out swine flu cases from run-of-the-mill respiratory disease. And there are simple things that people can do to protect themselves, like practicing better hygiene (wash hands frequently and cover mouth and nose when sneezing) and staying away from public places or traveling if they feel sick. "There's a role for everyone to play when an outbreak is ongoing," said Besser.

But the truth is that every outbreak is unpredictable, and there's a lot we don't know yet about the new swine flu. There hasn't been a flu pandemic for more than a generation, and there hasn't been a truly virulent pandemic since long before the arrival of mass air transit. We're in terra incognito here. Panic would be counterproductive - especially if it results in knee-jerk reactions like closing international borders, which would only complicate the public-health response. But neither should we downplay our very real vulnerabilities. As Napolitano put it: "This will be a marathon, not a sprint." Be prepared.



A quarantine official is reflected on a monitor as he checks the temperatures of arriving passengers on a thermographic imaging device placed at Narita international airport, east of Tokyo April 27, 2009.REUTERS/Yuriko Nakao




A man walks past pigs on a field near Gerardo Leyva's home in the town of Xonacatlan, Mexico, Sunday, April 26, 2009. A week after the death of one of Mexico's first swine flu victims, Leyva's family still hasn't been given any medicine nor has any public health worker interviewed them about contacts with pigs or other potential swine flu sources.(AP Photo/Miguel Tovar)


A funeral wreath sits on Gerardo Leyva's grave in the town of Xonacatlan, Mexico, Sunday, April 26, 2009. A week after the death of one of Mexico's first swine flu victims, Leyva's family still hasn't been given any medicine nor has any public health worker interviewed them about contacts with pigs or other potential swine flu sources.(AP Photo/Miguel Tovar)

By BRYAN WALSH time.com

Sunday, April 26, 2009

Flu Pandemics

1918: The Spanish flu pandemic remains the most devastating outbreak of modern times - infecting up to 40% of the world's population and killing more than 50m people, with young adults particularly badly affected.
1957: Asian flu killed two million people. Caused by a human form of the virus, H2N2, combining with a mutated strain found in wild ducks. The elderly were particularly vulnerable.
1968: An outbreak first detected in Hong Kong, and caused by a strain known as H3N2, killed up to one million people globally, with those over 65 most likely to die.
Swine Flu: Swine flu is a respiratory disease found in pigs. Human cases usually occur in those who have contact with pigs. Human-to-human transmission is rare and such cases are closely monitored
Source: BBC

Saturday, April 25, 2009

Swine Flu - Questions and Answers

Mexico is contending with an outbreak of swine flu, suspected in the deaths of dozens of people and sickening perhaps 1,000. In the United States, at least eight cases have been confirmed with the infection, all of them in California and Texas; only one person was hospitalized. Here are some questions and answers about the illness:

Q. What is swine flu?
A. Swine flu is a respiratory illness in pigs caused by a virus. The swine flu virus routinely causes outbreaks in pigs but doesn't usually kill many of them.

Q. Can people get swine flu?
A. Swine flu viruses don't usually infect humans. There have been occasional cases, usually among people who've had direct contact with infected pigs, such as farm workers. "We've seen swine influenza in humans over the past several years, and in most cases, it's come from direct pig contact. This seems to be different," said Dr. Arnold Monto, a flu expert with the University of Michigan.

Q. Can it spread among humans?
A. There have been cases of the virus spreading from human to human, probably in the same way as seasonal flu, through coughing and sneezing by infected people.

Q. What are the symptoms of swine flu?
A. The symptoms are similar to those of regular flu — fever, cough, fatigue, lack of appetite.

Q. Is the same swine flu virus making people sick in Mexico and the U.S.?
A. The Centers for Disease Control and Prevention said the Mexican virus samples match the U.S. virus. The virus is a mix of human virus, bird virus from North America and pig viruses from North America, Europe and Asia.

Q. Are there drugs to treat swine flu in humans?
A. There are four different drugs approved in the U.S. to treat the flu, but the new virus has shown resistance to the two oldest. The CDC recommends the use of the flu drugs Tamiflu and Relenza.

Q. Does a regular flu shot protect against swine flu?
A. The seasonal flu vaccine used in the U.S. this year won't likely provide protection against the latest swine flu virus. There is a swine flu vaccine for pigs but not for humans.

Q. Should residents of California or Texas do anything special?
A. The CDC recommends routine precautions to prevent the spread of infectious diseases: wash your hands often, cover your nose and mouth when you cough or sneeze, avoid close contact with sick people. If you are sick, stay at home and limit contact with others.

Q. What about traveling to Mexico?
A. The CDC has not warned Americans against traveling to Mexico but advises that they be aware of the illnesses there and take precautions to protect against infections, like washing their hands.


Source: Centers for Disease Control and Prevention



Soldiers patrol the streets wearing face masks as prevention against the swine flu virus in Mexico City. A new flu feared to have killed up to 81 people in Mexico has "pandemic potential," the World Health Organization has warned, as concerns grow of the virus spreading in the US and worldwide(AFP/Luis Acosta)



St. Francis Preparatory School in the borough of Queens is seen in New York April 25, 2009. At least eight students at the high school are suspected of having the swine influenza. A new flu virus that has killed up to 81 people in Mexico could start a global epidemic, the World Health Organization warned on Saturday as the disease spread further in the United States.REUTERS/Shannon Stapleton (UNITED STATES HEALTH DISASTER EDUCATION)

Swine influenza

Swine Influenza is an acute, febrile respiratory disease of swine with high morbidity and low mortality. It is commonly known in the industry as Swine Flu, Hog Flu, and Pig Flu. The etiology of Hog Flu is a Type A Influenza virus which belongs to the Orthomyxoviridae family. It is an enveloped, RNA virus with a lipid envelope and a helical nucleocapsid.

There are two structural proteins present on the virus. A Hemagglutinin and Neuraminidase protein. There are 13 different types of Hemagglutinin proteins. This hemagglutin protein is responsible for the attachment of the virus to the host-cell and for fusion of the viral envelope to the host-cell membrane. This results in agglutination of red blood cells. There are 9 different types of the neuraminidase protein. It is responsible for elution of virus from erythrocytes. It may play a role in the release of virus from infected cells.

These proteins play important roles in antibody formation and function. Antibodies to the hemagglutinin are responsible for preventing infection with an influenza virus containing the same hemagglutinin protein. Where as antibodies against the neuraminidase restrict the spread of virus from infected cells.

The antigenic characteristics of the 2 surface glycoproteins are the bases for dividing the virus into subtypes. The four main subtypes which have been isolated in swine are H1N1, H1N2, H3N2, and H1N7. Studies have shown that 30% of the entire swine population in the U.S. have been exposed to H1N1. More specifically, 51% of swine in the north central U.S. have been exposed.

Transmission
Influenza is transmitted primarily pig-to-pig by the nasopharyngeal route. Nasal secretions are laden with virus during the acute febrile stage. The virus is easily carried and spread by avian species, particularly waterfowl, and humans. Care should be taken to prevent spread from and between birds and humans to swine. The virus can be shed for 30 days post-inoculation and has been recovered from clinically normal animals.

Clinical Signs
The clinical signs of Swine Influenza are typical flu-like symptoms. The pigs will develop a fever, (40.5oC - 41.7oC), nasal and ocular discharge, and severe spasms of coughing. They will appear lethargic and become anorectic. These signs will appear very suddenly, spread rapidly throughout the entire barn, and persist for about 7 days. Then the pigs will almost recover about as quickly as they develop clinical signs. These outbreaks typically occur in the fall and early winter, and are more frequently seen in nursery through finishing age pigs.

Pathogenesis and Pathology
It is speculated that pigs maintain the virus by passing the virus to young susceptible animals. The virus is probably in constant circulation but there is not any evidence to confirm the existence of a long term true carrier state. The incubation period for swine influenza virus ranges from 1 to 3 days. The virus is inhaled and deposited on the surface of the lower respiratory tract. Research has shown that a widespread interstitial pneumonia will exist up to 21 days after infection and hemorrhagic lymph nodes will be seen. A major concern with Swine Influenza is the economic loss seen with uneven growth and prolonged finishing time. It has been documented that these pigs will lose from 5 to 12 pounds of body weight over a 3 to 4 week period.

Typically, uncomplicated infections have changes seen in the cranial ventral lung lobes. There is generally a sharp line of demarcation between normal and affected lung tissue. The involved areas are often purple and firm. Some interlobular edema may also be evident. The airways are likely to be filled with blood-tinged fibrinous exudate. Often the bronchial and mediastinal lymph nodes are enlarged. Severe cases may result in a fibrinous pleuritis. Microscopic lesions usually consist of airways filled with exudate, widespread alveolar atelectasis, interstitial pneumonia and emphysema. Peribronchial and perivascular cellular infiltration is also seen.

Diagnosis
Diagnosis of Swine Influenza can be based on clinical signs, virus isolation, histopathological confirmation of lesions, paired serology, and antigen detection.

Treatment
The treatment for Swine Influenza is pretty basic. The primary treatment is supportive therapy. These infected pigs require a dry, clean, dust free environment. We need to decrease any drafts which may be in the barns so that the pigs will be as comfortable as possible. Be sure to avoid any stress to the animals. Do not move any animals or mix animals from different pens. Antibiotics are also essential to treat and control any secondary bacterial infections that usually develop. Water medication does not seem to work as efficiently as parenteral injections to clinically infected animals. Expectorants are commonly used as a herd treatment and are administered in the drinking water.

Prevention and Control
The best way to deal with Swine Influenza is to prevent the occurrence and spread of the disease. There are certain parameters that one can follow that will prevent and control the disease in a herd.

Limited movement ia a herd is essential. Try to avoid purchasing new stock and avoid taking animals to exhibits where they will be in contact with other animals. One should also avoid moving any animals within the barn itself to eliminate any excess stress. If any new herd additions are to be entered into a herd, be sure to isolate these animals, preferably in a separate building. Screen these animals by serology to determine if these animals have been exposed to Swine Influenza, and if so virus isolation should be considered.

Standard sanitary measures can also help prevent and control the spread of virus. Influenza A viruses are inactivated by soap, heat, and formalin. Be sure to clean and disinfect trucks, trailers, and any equipment which may be contaminated. If a group of finishing pigs had Swine Influenza, be sure to clean and disinfect the house completely before the next group enters.

Vaccination is another means of controlling Swine Influenza. There have been commercial vaccines available in Europe for a while which have had considerable variation in antibody response and protection from infection following vaccination. Only within the last year has there been a vaccine licensed for use in swine in the U.S. It was developed by Syntro Vet Incorporated and is an oil-in-water vaccine containing Influenza A, H1N1 subtype. Results from various studies show that vaccinated animal exposed to Swine Influenza Virus have markedly reduced nasal shedding, virus infection in lung tissue, and lung pathology than nonvaccinated animals.

Studies have also shown than maternally derived antibody in vaccinated sows protected 5 week old pigs from clinical disease, virus infection in the lung, and lung pathology. Maternal antibody did not prevent nasal viral shedding. There is more research underway to determine when pigs from vaccinated sows can be actively immunized and to determine the duration of immunity.

2009 H1N1 flu outbreak
Main article: 2009 H1N1 flu outbreak
In March and April 2009, more than 1,000 cases of swine flu in humans were detected in Mexico, the southwestern United States, New York City metropolitan area, and two in Kansas, causing more than 80 deaths in Mexico. Following a series of reports of isolated cases of swine flu, the first announcement of the outbreak in Mexico was documented on April 23. Some of the cases have been confirmed by the World Health Organization to be due to a new genetic strain of H1N1. The new strain has been confirmed in 16 of the deaths and 44 others are being tested as of 24 April 2009. The Mexican fatalities are mainly young adults, a hallmark of pandemic flu.

The current vaccine against the seasonal influenza strain H1N1 is thought unlikely to provide protection. Anne Schuchat, director of CDC's National Center for Immunization and Respiratory Diseases, said that the United States cases were found to be made up of genetic elements from four different flu viruses—North American swine influenza, North American avian influenza, human influenza A virus subtype H1N1, and swine influenza virus typically found in Asia and Europe. For two cases a complete genome sequence had been obtained. She said that the virus was resistant to amantadine and rimantadine, but susceptible to oseltamivir (Tamiflu) and zanamivir (Relenza).

The new strain appears to be a recombinant between two older strains. Preliminary genetic characterization found that the hemagglutinin (HA) gene was similar to that of swine flu viruses present in U.S. pigs since 1999, but the neuraminidase (NA) and matrix protein (M) genes resembled versions present in European swine flu isolates. Viruses with this genetic makeup had not previously been found to be circulating in humans or pigs, but there is no formal national surveillance system to determine what viruses are circulating in pigs in the U.S


Hiram Diaz, 8, left, gives his 6-year-old sister Adely Diaz a ride on the pegs of his bicycle while wearing protective masks near the market where their parents own a store in Mexico City, Saturday, April 25, 2009. Mexico is struggling with a new strain of swine flu that has killed 68 and sickened more than 1,000. The World Health Organization declared the outbreak a 'public health emergency of international concern.' (AP Photo/Houston Chronicle, Julio Cortez)


A quarantine official checks the temperatures of arriving passengers on a thermographic imaging device placed in front of the quarantine station of Narita international airport, east of Tokyo April 25, 2009. The device has already been place at the airport, but an airport quarantine official said that they have strengthened its monitoring activities in the wake of a swine flu outbreak in Mexico.REUTERS/Yuriko Nakao (JAPAN HEALTH IMAGES OF THE DAY)

2nd President of The United States - John Adams

Learned and thoughtful, John Adams was more remarkable as a political philosopher than as a politician. "People and nations are forged in the fires of adversity," he said, doubtless thinking of his own as well as the American experience.


Adams was born in the Massachusetts Bay Colony in 1735. A Harvard-educated lawyer, he early became identified with the patriot cause; a delegate to the First and Second Continental Congresses, he led in the movement for independence.

During the Revolutionary War he served in France and Holland in diplomatic roles, and helped negotiate the treaty of peace. From 1785 to 1788 he was minister to the Court of St. James's, returning to be elected Vice President under George Washington.

Adams' two terms as Vice President were frustrating experiences for a man of his vigor, intellect, and vanity. He complained to his wife Abigail, "My country has in its wisdom contrived for me the most insignificant office that ever the invention of man contrived or his imagination conceived."

When Adams became President, the war between the French and British was causing great difficulties for the United States on the high seas and intense partisanship among contending factions within the Nation.

His administration focused on France, where the Directory, the ruling group, had refused to receive the American envoy and had suspended commercial relations.

Adams sent three commissioners to France, but in the spring of 1798 word arrived that the French Foreign Minister Talleyrand and the Directory had refused to negotiate with them unless they would first pay a substantial bribe. Adams reported the insult to Congress, and the Senate printed the correspondence, in which the Frenchmen were referred to only as "X, Y, and Z."

The Nation broke out into what Jefferson called "the X. Y. Z. fever," increased in intensity by Adams's exhortations. The populace cheered itself hoarse wherever the President appeared. Never had the Federalists been so popular.


Congress appropriated money to complete three new frigates and to build additional ships, and authorized the raising of a provisional army. It also passed the Alien and Sedition Acts, intended to frighten foreign agents out of the country and to stifle the attacks of Republican editors.
President Adams did not call for a declaration of war, but hostilities began at sea. At first, American shipping was almost defenseless against French privateers, but by 1800 armed merchantmen and U.S. warships were clearing the sea-lanes.

Despite several brilliant naval victories, war fever subsided. Word came to Adams that France also had no stomach for war and would receive an envoy with respect. Long negotiations ended the quasi war.

Sending a peace mission to France brought the full fury of the Hamiltonians against Adams. In the campaign of 1800 the Republicans were united and effective, the Federalists badly divided. Nevertheless, Adams polled only a few less electoral votes than Jefferson, who became President.
On November 1, 1800, just before the election, Adams arrived in the new Capital City to take up his residence in the White House. On his second evening in its damp, unfinished rooms, he wrote his wife, "Before I end my letter, I pray Heaven to bestow the best of Blessings on this House and all that shall hereafter inhabit it. May none but honest and wise Men ever rule under this roof."

Adams retired to his farm in Quincy. Here he penned his elaborate letters to Thomas Jefferson. Here on July 4, 1826, he whispered his last words: "Thomas Jefferson survives." But Jefferson had died at Monticello a few hours earlier.
Source: White House

Thursday, April 23, 2009

Harvard University is the best university in North America

Harvard University is the best university in North America according to the Academic Ranking of World Universities (ARWU). The ARWU is published by the Institute of Higher Education at the Shanghai Jiao Tong University and several indicators of academic or research performance are used to establish the ranking, these include highly cited researchers, articles indexed in major citation indices and staff winning Nobel Prizes. There are 190 universities located in North America in the Word’s Top-500 universities (2008). The Top-5 universities in North America are: 1. Harvard University (ranked 1st in the world); 2. Stanford University (ranked 2nd); 3. University of California - Berkeley (3rd); 4. Massachusetts Institute of Technology (5th); and 5. "> California Institute of Technology (6th). All of the Top-5 universities are located in the United States (US) and it is striking that they are all located in only two States (California (3) and Massachusetts (2)).
An earlier analysis of the World’s Top-500 universities revealed that 36% of the US universities were located in just five States: New York (15), California (13), Texas (13), Massachusetts (9) and Pennsylvania (7) (click here). Harvard University was established in 1636 and is the oldest institution of higher learning university in the US. It is a private institution with an annual budget of $3.2 billion (2007). It has been the top-university in North America (and the world) in every year since 2003 (when the ARWU was first published). The total number of students at Harvard is about 20,000: roughly 6,700 undergraduates and 12,300 graduate and professional students. There are nine faculties (e.g. the Harvard Business School and the Faculty of Medicine) with about 1,900 faculty members and more than 10,000 academic appointments in affiliated teaching hospitals. Harvard University has the world's largest university endowment ($36.9 billion in 2008). The endowment is a very important source of income, contributing more than one third ($1.6 billion) of the university’s operating budget in 2008.

All AboutUni.com was founded by John Paget and launched in November 2007. He has been visiting university campuses around the world since the 1980s and wanted to share this information with others. John Paget was brought up in Switzerland where he attended the International School of Geneva and was exposed to the growing demand for international higher education studies. John Paget studied Economics at the London School of Economics and then completed graduate studies in the United Kingdom and Switzerland.

Top 10 universities in the US

Based on the world university ranking done by the Time Higher Education in late 2008, top 10 universities in the US are ranked below:

1. Harvard University
2. Yale University
3. California Institute of Technology
4. University of Chicago
5. Massachusetts Institute of Technology
6. Columbia University
7. University of Pennsylvania
8. Princeton University
9. Duke University
10. Johns Hopkins University

Tuesday, April 21, 2009

Ozone layer will recover in future, predict scientists

A new research by NASA scientists has suggested that the ozone layer might recover in the future, thanks to the changing climate and atmospheric circulation.
According to the scientists, Earth’s ozone layer should eventually recover from the unintended destruction brought on by the use of chlorofluorocarbons (CFCs) and similar ozone-depleting chemicals in the 20th century, since greenhouse gases are changing the dynamics of the atmosphere.
Previous studies have shown that while the buildup of greenhouse gases makes it warmer in troposphere - the level of atmosphere from Earth’s surface up to 10 kilometers (6 miles) altitude - it actually cools the upper stratosphere - between 30 to 50 kilometers high (18 to 31 miles).
This cooling slows the chemical reactions that deplete ozone in the upper stratosphere and allows natural ozone production in that region to outpace destruction by CFCs.
But, the accumulation of greenhouse gases also changes the circulation of stratospheric air masses from the tropics to the poles, according to NASA scientists.
In Earth’s middle latitudes, that means ozone is likely to ‘over-recover,’ growing to concentrations higher than they were before the mass production of CFCs.
In the tropics, stratospheric circulation changes could prevent the ozone layer from fully recovering.
‘Most studies of ozone and global change have focused on cooling in the upper stratosphere,’ said Feng Li, an atmospheric scientist at the Goddard Earth Sciences and Technology Center at the University of Maryland Baltimore County, Baltimore, Maryland, and lead author of the study.
‘But, we find circulation is just as important. It’s not one process or the other, but both,’ he added.
The findings are based on a detailed computer model that includes atmospheric chemical effects, wind changes, and solar radiation changes.
Working with Richard Stolarski and Paul Newman of NASA’s Goddard Space Flight Center, Greenbelt, Maryland, Li adapted the Goddard Earth Observing System Chemistry-Climate Model (GEOS-CCM) to examine how climate change will affect ozone recovery.
The team inserted past measurements and future projections of ozone-depleting substances and greenhouse gases into the model.
Then, the model projected how ozone, the overall chemistry, and the dynamics of the stratosphere would change through the year 2100.
Though the concentration of chlorine and other ozone-depleting substances in the stratosphere will not return to pre-1980 levels until 2060, the ozone layer over middle latitudes is predicted to recover to pre-1980 levels by 2025. (ANI)
Source: by sindhtoday.net. Last update: 12 April, 2009

What is Ozone?

Ozone is a gas made up of three oxygen atoms (O3). It occurs naturally in small (trace) amounts in the upper atmosphere (the stratosphere). Ozone protects life on Earth from the Sun’s ultraviolet (UV) radiation. In the lower atmosphere (the troposphere) near the Earth’s surface, ozone is created by chemical reactions between air pollutants from vehicle exhaust, gasoline vapors, and other emissions. At ground level, high concentrations of ozone are toxic to people and plants.

Stratospheric “good” ozone
Ninety percent of the ozone in the atmosphere sits in the stratosphere, the layer of atmosphere between about 10 and 50 kilometers altitude. The natural level of ozone in the stratosphere is a result of a balance between sunlight that creates ozone and chemical reactions that destroy it. Ozone is created when the kind of oxygen we breathe—O2—is split apart by sunlight into single oxygen atoms. Single oxygen atoms can re-join to make O2, or they can join with O2 molecules to make ozone (O3). Ozone is destroyed when it reacts with molecules containing nitrogen, hydrogen, chlorine, or bromine. Some of the molecules that destroy ozone occur naturally, but people have created others.

The total mass of ozone in the atmosphere is about 3 billion metric tons. That may seem like a lot, but it is only 0.00006 percent of the atmosphere. The peak concentration of ozone occurs at an altitude of roughly 32 kilometers (20 miles) above the surface of the Earth. At that altitude, ozone concentration can be as high as 15 parts per million (0.0015 percent).

The concentration of ozone varies with altitude. Peak concentrations, an average of 8 molecules of ozone per million molecules in the atmosphere, occur between an altitude of 30 and 35 kilometers.

Ozone in the stratosphere absorbs most of the ultraviolet radiation from the Sun. Without ozone, the Sun’s intense UV radiation would sterilize the Earth’s surface. Ozone screens all of the most energetic, UV-c, radiation, and most of the UV-b radiation. Ozone only screens about half of the UV-a radiation. Excessive UV-b and UV-a radiation can cause sunburn and can lead to skin cancer and eye damage.


Solar ultraviolet radiation is largely absorbed by the ozone in the atmosphere—especially the harmful, high-energy UV-a and UV-b. The graph shows the flux (amount of energy flowing through an area) of solar ultraviolet radiation at the top of the atmosphere (top line) and at the Earth’s surface (lower line). The flux is shown on a logarithmic scale, so each tick mark on the y-axis indicates 10 times more energy.

Increased levels of human-produced gases such as CFCs (chlorofluorocarbons) have led to increased rates of ozone destruction, upsetting the natural balance of ozone and leading to reduced stratospheric ozone levels. These reduced ozone levels have increased the amount of harmful ultraviolet radiation reaching the Earth’s surface. When scientists talk about the ozone hole, they are talking about the destruction of stratospheric, “good,” ozone.

Tropospheric “bad” ozone
Although ozone high up in the stratosphere provides a shield to protect life on Earth, direct contact with ozone is harmful to both plants and animals (including humans). Ground-level, “bad,” ozone forms when nitrogen oxide gases from vehicle and industrial emissions react with volatile organic compounds (carbon-containing chemicals that evaporate easily into the air, such as paint thinners). In the troposphere near the Earth’s surface, the natural concentration of ozone is about 10 parts per billion (0.00001 percent). According to the Environmental Protection Agency, exposure to ozone levels of greater than 80 parts per billion for 8 hours or longer is unhealthy. Such concentrations occur in or near cities during periods where the atmosphere is warm and stable. The harmful effects can include throat and lung irritation or aggravation of asthma or emphysema.
Source: NASA, Last Updated: December 16, 2008

The Importance of Environment

Environment: Humans have always inhabited two worlds. One is the natural world of plants, animals, soils, air, and water that preceded us by billions of years and of which we are a part. The other is the world of social iinstitutions and artifaces that we create for ourselves using science, technology, and political organization. Both worlds are essential to our lives, but intergrating them successfully causes enduring tensions.
Where earlier people had limited ability to alter their surroundings, we now have power to extract and consume resources, produce wastes, and modify our world in ways that threaten both our continued existence and that of many organisms with which we share the planet. To ensure a sustainable future for ourselves and future generations, we need to understand something about how our world works, what we are doing to it, and what we can do to protect and improve it.

Environment ( from the French environner: to encircle or surround) can be defined as (1) the circumstances or conditions that surround an organism or group of organisms, or (2) the complex of social or cultural conditions that effect an individual or community. Since humans inhabit the natural world as well as the "built" or technological, social, and cutural world, all constitute important parts of our environment.

Word "environment" is most commonly used describing "natural" environment and means the sum of all living and non-living things that surround an organism, or group of organisms. Environment includes all elements, factors , and conditions that have some impact on growth and development of certain organism. Environment includes both biotic and abiotic factors that have influence on observed organism. Abiotic factors such as light, temperature, water, atmospheric gases combine with biotic factors (all surrounding living species). Environment often changes after some time and therefore many organisms have ability to adapt to these changes. However tolerance range is not the same with all species and exposure to environmental conditions at the limit of an certain organism's tolerance range represents environmental stress.

So why is environment important?
The simplest explanation about why the environment matters is that, as humans, the environment—the Earth—is our home. It is where we live, breathe, eat, raise our children, etc. Our entire life support system is dependent on the well-being of all of the species living on earth. This is commonly referred to as the biosphere, a term created by Vladimir Vernadsky, a Russian scientist in the 1920s.The biosphere refers to one global ecological system in which all living things are interdependent

Food Chain
The food chain is an example of this. The sun provides light and heat for plants. The plants are consumed by animals who are in turn consumed by other animals who may in turn, be consumed by humans. Or perhaps they are used for material, clothing, etc. Even insects like mosquitoes play a role and of course bees pollinate plants.

Ecosystem
Within the overall biosphere, or ecosystem, there are smaller ecosystems like the rainforests, marine ecosystems, the desert and the tundra. When any of these systems are off kilter, it impacts the entire planet. All of the environmental problems that exist have far-reaching implications for the health of our planet and its inhabitants.

For example, global warming causes a rise in sea levels which effects marine life. The rising sea levels also cause land erosion which harms the habitats of animals living by the coast. Global warming also melts polar caps and leads to arctic shrinking. This endangers the polar bears and other arctic wildlife. Since the icecaps are made of fresh water, they will throw off the saline levels in the ocean which will affect ocean currents. Furthermore, the ice caps reflect light. As they disappear the Earth will get darker and absorb more heat increasing the Earth's temperature.

Threat of Environmental Degradation
The deterioration of the environment, often referred to as environmental degradation, threatens the earth's natural resources such as our clean water supply, fossil fuels for energy and food supply. Many of these resources are nonrenewable so when they run out we will be forced to find new alternatives.

Natural Beauty
Another reason why the environment is so important is because it is a source of natural beauty. According to Healthy nature healthy people: contact with nature as an upstream health promotion intervention for populations, a research paper written by Cecily Maller, Mardie Townsend, Anita Pryor, Peter Brown and Lawrence St Leger, nature plays a key role in human health and well-being. The paper even suggests that contact with nature might play a role in preventing mental illness.

Unfortunately the planet is in danger. Many species of animals and plants are nearing distinction. Our clean water supply is at risk and more and more of our beautiful, open spaces are disappearing as new buildings and factories are built.

The environment is important because it is the only home we have. Many experts believe that we can reverse some of the harm the planet has suffered. The challenge is getting enough people to take drastic enough action so that we can make a difference in our lifetime.

Selected Top Ten Universities In The World

The Times Higher World University Rankings, compiled by QS Quacquarelli Symonds Network, represent a first attempt to compare the world's top universities.The ranking is available on the Times Higher Education Supplement (THES) website or on the QS Network and is based on the following multiple indicators:

• Peer reviewing, based on a poll of 1,300 academics in 88 countries.
• The Teachers/Students ratio.
•The internationalization rate, given by the percentage of the academic staff and of the students coming from other countries.
• The number of research citations, based on the Essential Science Indicators edited by Thomson Scientific.

Reported tables contain data available on the Times Higher Education Supplement website and edited by QS Quacquarelli Symonds Ltd.

The World's Top 10 Universities

Rank Name Country Score
1 Harvard University US 100
2 Yale University US 99.8
3 University of Cambridge UK 99.5
4 University of Oxford UK 98.9
5 California Institute of Technology (Caltech) US 98.6
6 Imperial College London UK 98.4
7 University College London (UCL) UK 98.1
8 University of Chicago US 98.0
9 Massachussets Institute of Technology (MIT) US 96.7
10 Columbia University US 96.3

The World's Top 10 natural science universities

Rank Name Country Score
1 Massachussets Institute of Technology (MIT) US 100
2 University of California, Berkeley US 99.5
3 University of Cambridge UK 98.3
4 Harvard University US 96.1
5 University of Oxford UK 92.3
6 Princeton University US 91.1
7 California Institute of Technology (Caltech) US 90.7
8 Stanford University US 88.0
9 University of Toronto Canada 79.2
10 University of Tokyo Japan 77.2

Top 10 European universities

Rank Name Country Score
1 University of Cambridge UK 99.5
2 University of Oxford UK 98.9
3 Imperial College London UK 98,4
4 UCL (University College London) UK 98.1
5 King's College London UK 89,5
6 University of Edinburgh UK 89,3
7 EHT Zurich (Swiss Federal Institute of Technology) Switzerland 89.1
8 Ecole Normale Superieure, Paris France 84.8
9 University of Manchester UK 84.4
10 University of Bristol UK 84.1

Source: The Times Higher Education Supplement and QS Quacquarelli Symonds Ltd, 2008, published february 2009

Monday, April 20, 2009

World University Rankings 2008 - The Top 30 World Universities

According to the world university rankings report made by QS Ltd, October 9, 2008, top 30 world universities were listed in the below table:

Ranking 2006 - 2007
Ranking 2007 - 2008

The World's Biggest Companies

In this picture: ranked second last year, General Electric is now the world’s largest company, based on its composite score for sales, profits, assets and market value.

This comprehensive report analyzes the world's biggest companies and the fastest-growing of these titans.

Even a depression is a place for opportunity if you have cash, scale and ambition. Many of the names on this year's Forbes Global 2000 list of the world's biggest companies will emerge on the other side of the trough far stronger when world economies snap back next year. For the strong corporations, there are rivals to buy, technologies to fund and new markets to enter--all at lower prices than we've seen in years. ''Despite the economy, it's important to think about what is possible,'' says Microsoft Chief Executive Steven Ballmer.

Forbes' ranking of the world's biggest companies departs from lopsided lists based on a single metric, like sales. Instead, we use an equal weighting of sales, profits, assets and market value to rank companies according to size. This year's list reveals the dynamism of global business. The rankings span 62 countries, with the U.S. still dominant at 551 members, but that is 200 fewer than in 2004, when we first published this global list.

This year, China has 91 members, Korea, 61, and India, 47. Even Kazakhstan is now a Global 2000 member. Also gaining a significant presence on our list are corporations from Arab countries: Kuwait, Saudi Arabia and the United Arab Emirates each have at least 10 entries on this year's list

In total, the Global 2000 companies now account for $32 trillion in revenues, $1.6 trillion in profits, $125 trillion in assets and $20 trillion in market value. The Global 2000 continues to amass revenue and assets, but lately, that has not translated into wealth creation or profits. In the past year, combined profits were down 31% while market value was down 49%.

The global economy this year will likely contract for the first time since World War II, according to the World Bank. The encouraging news is that the same pool of economists who are pessimistic about this year expect a slight recovery in 2010, albeit at sharply disparate levels, depending on where you live. The current forecast calls for 8.3% gross domestic product growth in China in 2010 compared with estimated growth in 2009; 1.7% in the U.S. and -0.1% in Spain.

An analysis of the Global 2000 shows that despite the turmoil in the banking industry, banks still dominate, with 307 companies in the 2000 lineup, thanks in large measure to their asset totals. The oil and gas industry, with 126 companies, scores high in sales, profits and stock-market value, yet these sectors were not the leaders in growth over the past year. Drug and biotech companies (up 59%) led all sectors in sales growth, while the leaders in profit growth were telecom service firms (up 51%).
Our full list is rich with industry leaders who are making strategic moves to help navigate through these tough economic times. Read our profiles of Denmark’s Vestas Wind Systems, the world’s largest maker of wind turbines, German engineering giant Siemens, banking software seller Fiserv and Standard Chartered Group of the U.K.Vestas, for example, is making a big push in the U.S. market for green energy, and is building three plants in Colorado.

For the past few years, we have also identified an important subset of the Global 2000: big companies that also have exceptional growth rates. To qualify as a Global High Performer, a company must stand out from its industry peers in growth, return to investors and future prospects. Most of the 130 Global High Performers have been expanding their earnings at 28% a year or better--easy for a start-up, hard for a blue-chip.

Both Vetas and Standard Chartered Group are on our Global High Performers, and nearly half of the 130 companies on this select list have headquarters outside the U.S. Members include well-known foreign companies such as ABB ( ABB - news - people ) and Nestlé (Switzerland); Honda Motor ( HMC - news - people ), Toyota Motor ( TM - news - people ) and Nintendo ( NTDOY.PK - news - people ) (Japan); as well as foreign companies with lower profiles, such as French contractor Vinci. Among notable U.S. Global High Performers are McDonald's ( MCD - news - people ), Google ( GOOG - news - people ) and Nike ( NKE - news - people ).

To find these global superstars, we analyzed 26 industries of the Global 2000 (we excluded trading companies) and gave each company respective scores for long-term and short-term sales and profit growth; return on capital; debt-to-capital (the lower, the better); and total return over five years. Other requirements for the global high performers list: shares traded in the U.S. or Depositary Receipts, a share price of at least $5, positive equity and sales of at least $1 billion.

The composite performance score for the Global High Performers also includes earnings growth forecasts tabulated by Thomson IBES. Finally, we dropped candidates with good numbers but big problems.



Special report by Scott DeCarlo, 08 April, 2009. forbes.com