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In these classes, no one ever struggles to stay awake

It's easy to get discouraged sometimes about the future of the planet. Here are four reasons to stay hopeful.

University researchers around the country are leading us back to the future

In China, on-campus environmentalism is a young but ever-growing movement. And it starts with the students.

How (and why) we came up with our list of America's greenest campuses

The complete list of Sierra's 2010 Cool Schools participants

Our fourth annual list of America's greenest campuses

Our fourth annual list of America's greenest campuses

In New York's urban core, pastoral dreams take root

Jettison the tent, the candle lantern, and that copy of Moby-Dick. Ultralight through-hiking takes you farther, faster.

NFL's greenest star aims his eco-efforts at underprivileged kids

When you're poor, the environmental movement doesn't stop at simple things like pollution

Angelenos share the San Gabriel Mountains with miners, nudists, anglers, and the occasional murderer.

If you think Walden Pond is transcendental, check out Maine's North Woods

A deal that one activist called Southern California's Louisiana Purchase will make life easier for game animals and other species

When climbers die, is the camera partly to blame?

"We are hardwired to be explorers"

It's easier to get into Heaps Canyon than to get out

Experts serve up their favorite herbal brews, all steeped in sustainability