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A soccer star kicks trash

Mining companies want to export U.S. coal to China. But first they have to go through Longview.

Everyone who goes to war comes home transformed. Two young veterans write about adventures that helped them figure out what changed.

California's massive, ancient redwoods have dealt with climate change before. But this time they might need our help.

Here's how to get there

The head of the Interagency Grizzly Bear Study Team is just a scientist trying to do his job (probably).

Next time you plan to celebrate hard, mitigate the morning-after misery

Laotians live and die among 80 million unexploded munitions, many of them as dangerous as the day they dropped from the sky

A Great Plains native finds his way home

Snowboarding icon Jeremy Jones climbs his way to the top—and hopes others will follow

In search of toothpastes that are hard on plaque but easy on the planet

Celebrating 50 years of the Arctic National Wildlife Refuge

What does it take for outdoor ed to change a life?

First round: professors. Second round: classes.

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