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The new five-part series shows that human relationships with nature need not be destructive.

Peabody Energy claims that half a million people support its "grassroots" campaign to fight energy poverty, but it smells a lot like Astroturf

From generating engine-ready propane to warding off disease, bacteria is the latest hero in science.

Big Ag may feed millions but tiny producers take the planet to heart.

It's time to sack your worn-out tees.

Humans will miss more than the honey if bee die-offs continue

Roberto Morales helped to designate the San Gabriel Mountains as a national monument.

Two social justice veterans meld Native American traditions with modern technology to create a better food system

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.

These natural features prove Mother Nature is a romantic.

Kenneth Brower reflects on the meaning of his father's metal goblets

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