A caravan of futuristic solar cars driven by university students is racing a 2,400-mile route to show what transportation could look without a drop of oil or gas.

Last year it was about the candidates. This year, at the Netroots Nation conference of left-leaning bloggers and political organizers, it's the climate.

A biologist is stalking a huge Cambodian stingray as part of a project that aims to document and protect freshwater giants on six continents.

Hundreds of baby penguins swept from the icy shores of Antarctica and Patagonia are washing up dead on Rio de Janeiro's tropical beaches, rescuers and penguin experts said.

For years, visitors wanting to see Denali National Park have had to ride school buses that polluted the air and spoiled the tranquillity with their noisy, carbon dioxide-spewing diesel engines.

A federal judge has restored endangered species protections for gray wolves in the Northern Rockies, derailing plans by three states to hold public wolf hunts this fall.

Texas officials gave the go-ahead Thursday to the nation's largest wind-power project, a plan to build $5 billion worth of new transmission lines.

Just as John F. Kennedy launched the space race, Al Gore is challenging the nation and the next president to produce every kilowatt of electricity through clean energy sources within 10 years.

As wildfire whipped toward a remote sanctuary of the endangered California condor last month, the rare birds got their biggest test in survival.

The best-case scenario for a transition to vehicles that run on hydrogen — and independence from oil — is promising, experts said Thursday in a report requested by Congress.