Mr. Green shows you how to find out if your local power supply is clean (or not).
The new five-part series shows that human relationships with nature need not be destructive.
Roberto Morales helped to designate the San Gabriel Mountains as a national monument.
Low-turnout elections are bad for the nation, and they're bad for the Sierra Club too.
Inside a former brewery in St. Paul, Minnesota, a company called Urban Organics is perfecting a new model of aquaponic food production.
Every day, the clean energy revolution is creating new jobs for American workers. As part of an ongoing series, Sierra asked one of them to tell us his story.
Two social justice veterans meld Native American traditions with modern technology to create a better food system
From generating engine-ready propane to warding off disease, bacteria is providing solutions.
Rooftop gardens--sometimes called green roofs--are a trendy topping for buildings, but there's a greener option.