Scientists found that 7.2 percent of Alaskan birds they tested were infected with avian malaria.
Artist Michael Swaine fixes clothes for free on San Francisco streets. But he envisions going beyond fighting throwaway culture to start helping others build community.
Who decides what's "natural" and what's "eco-friendly"? Umbra peels back the latest on the labeling debate.
Santa Monica couldn't have gotten so green without an engaged community, says its assistant director of sustainability. Solar-powered ferris wheels don't hurt, either.
Is it possible to have an enviro-themed costume that's not totally lame? Umbra scares up some suggestions.
Four men from small villages in the Niger Delta hope to hold Shell accountable for a series of pipeline leaks.
More Americans than ever are riding Amtrak, a 49 percent increase over 2000.
We're sure he's learned his lesson.
Bill McKibben did a bang-up job of talking about climate change on "Real Time with Bill Maher" -- and it got David Roberts thinking about effective climate communication.