Stripped-down "social bicycle system" takes a minimal approach to urban bike share.

As the Gulf disaster abates, scientists ponder the future of a ravaged ecosystem.

Annual study ranks consumer sustainability around the world.

Economic recession blamed for decline.

Former Formula One engineer unveils superlight eco car.

The New York Times reports.

Dot Earth asks why oil salvaged from the spill is going to BP instead of U.S. reserves.

Progressive regulations will eliminate most fast food packaging from the landfill.

On Earth Day 's 40th anniversary, John Kerry warns that climate change is the environment's biggest hurdle yet.

Images of an ecosystem in flux by wildlife photographer Paul Souders.