After paring 23 climate models down to the best half-dozen, two researchers now say with new confidence that arctic summer ice will most likely disappear around 2037. But none of the select models predicts a tipping point--a sudden jump to an ice-free summer Arctic.

Industrial-scale attempts to capture CO2 from coal-burning power plants or oil refineries and lock it away deep underground are getting an unprecedented boost from the U.S. government's $787 billion stimulus package.

Data from multiple ocean basins elucidate an ancient climate transition from greenhouse to icehouse.

About 34 million years ago, Earth's climate shifted from a relatively ice-free world to one with glacial conditions on Antarctica characterized by substantial ice sheets. How Earth's temperature changed during this climate transition remains poorly understood, and evidence for Northern Hemisphere polar ice is controversial.

How strong a part does water vapor play in global warming?

Archaeologists have long puzzled over the collapse of the mighty medieval Khmer kingdom in Southeast Asia best known for its resplendent capital, Angkor. New findings suggest that a decades-long drought at about the time the kingdom began fading away in the 14th century may have been a major culprit.

Improvements in the water quality of many freshwater and most coastal marine ecosystems requires reductions in both nitrogen and phosphorus inputs.

Richard Richards, a geneticist at CSIRO Plant Industry, is breeding
wheat varieties that can tough out prolonged droughts--and keep people
fed.

An outbreak of cholera in Zimbabwe has crossed the country's borders and is creating "an extraordinary public health crisis," outside experts say.

Lakes and reservoirs provide key insights into the effects and mechanisms of climate change.