Mass extinctions and other nightmare scenarios figure into one expert's speculations on what Earth would be like at 6°C (10.8°F) warmer.

Troops forced out the last holdouts after glowing rocks spewed from Chaitén. An expert warns that a catastrophic flow of toxic gas and ash could follow.

A "perfect storm" of factors—from location to wind speed to poor preparation—have resulted in perhaps a hundred thousand deaths from Cyclone Nargis.

The world's largest group of orangutans in Indonesia may face extinction by 2011 because of palm oil plantation expansion, which is destroying habitat, experts say.

The grassy prehistoric Sahara turned to desert more slowly than previously thought, a new report says—and some say global warming may turn the desert green once again.

Great tits are timing their egg laying to coincide with an earlier emergence of caterpillars in England, a decades-long study has found.

Thousands of horses, cows, and other livestock face a possibly toxic brew of deep ash and gases. And the region's all-important farms may be devastated for decades.

Bodies floated in floodwaters, and survivors tried to reach dry ground using blankets as sails, while a U.S. diplomat said up to a hundred thousand may have died.

Eight Amur leopards—the world's rarest big cats—were recently photographed in far southeastern Russia, giving renewed hope to conservationists.

A new "Greendex" survey tracking consumer spending habits also found that the residents of the U.S. and other industrialized nations are the most wasteful.

After 9,000 years Chaiten volcano has exploded back to life, forcing people to flee its southern Chile region.

Wildlife officials in the Cayman Islands are struggling to determine who killed six extremely rare blue iguanas recently found butchered in a nature preserve.

Debate has heated up over a controversial theory that suggests huge comet impacts wiped out North America's large mammals nearly 13,000 years ago.

Pioneering measures developed at a Costa Rican agricultural school are helping growers across the world lessen the environmental impact of the popular fruit.

Burying surrounding areas in a shroud of ash and mud, the volcano has led to thousands of evacuations over its five-day eruption.