A kilometers-long ice core from Antarctica has been recording climate information for the past 800,000 years and has revealed a three millennia–long period when carbon dioxide levels in the air were lower than any previously measured.

“New Orleans, at the end of the century, will be an island” — literally, predicts Bruce Babbitt. Whether or not you believe his assessment, he makes a good case for considering the implications of climate change when planning federal projects.

Fossil-fuel pollution has been offsetting global warming to the tune of about 30 percent per year. Cleaning up that pollution, a must, threatens to accelerate warming unless humanity changes its fuel-use strategy.

An unusual layer of rock found along Britain's northwestern coast formed from the debris thrown out of a crater when a meteorite struck nearby more than 1 billion years ago.

The Tibetan Plateau formed when the Indian and Eurasian plates collided, but scientists may have had the order of events wrong.

Nitrate, a common pollutant, may also perturb reproductive hormones—at least in frogs.

The North Atlantic's Gulf Stream affects the overlying atmosphere more strongly than previously suspected.