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...biggest questions in climate sensitivity has been the role of low-level cloud cover. Low-altitude clouds reflect some of the sun's radiation back into the atmosphere, cooling the earth. It's not yet known whether global warming will dissipate clouds, which would effectively speed up the process of climate change, or increase cloud cover, which would slow it down. (See pictures of the effects of global warming...
...data showed that as the Pacific Ocean has warmed over the past several decades - part of the gradual process of global warming - low-level cloud cover has lessened. That might be due to the fact that as the earth's surface warms, the atmosphere becomes more unstable and draws up water vapor from low altitudes to form deep clouds high in the sky. (Those types of high-altitude clouds don't have the same cooling effect.) The Science study also found that as the oceans warmed, the trade winds - the easterly surface winds that blow near the equator - weakened, which...
...question now is whether this process will continue in the future, as the world keeps warming. Scientists create climate models to try to predict how the earth will respond to higher levels of greenhouse-gas emissions, but only one model - created by the Hadley Centre in Britain - includes the possible impact of changing cloud behavior. And the bad news is that the Hadley model contains particularly high temperature increases for the 21st century, in part because it sees dissipating cloud cover as a positive-feedback cycle - meaning the warmer it gets, the less cloud cover there will be, which will...
...with Polaroid and founded a company specializing in selling equipment for analog instant photography. An official partner of Polaroid, the company still operates via the website Polapremium.com, where enthusiasts can buy the camera, related equipment and some of the remaining film stock. (See pictures of historical photos on Google Earth...
...good looks and 25¢ will get you a phone call. Australia has a higher proportion of naturally rugged men than any other country on Earth, but combined, its two most recent Prime Ministers, John Howard and Kevin Rudd, have the sex appeal of a church mouse. Who cares? Both have made tough calls--Howard to back the U.S. through thick and thin after 9/11, Rudd to apologize for the treatment of Australia's Aborigines--and they've been stewards of one of the world's longest-lasting economic booms...