Why the biofuels movement could run out of gas
Rakesh Jaiswal, founder of ecofriends.org, talks about the country's growing list of environmental problems
Where did the world's highest mountains come from? Geologist Elizabeth Catlos takes a new view
To clean highly polluted groundwater, Michael Wong has developed a detergent based on gold
One hundred fifty years after the publication of Walden, Henry David Thoreau is helping scientists monitor global warming
How mercury gets into tuna and other fish in the ocean has scientists searching from the coast to the floor
A sea life lover's guide to seafood
Coral reefs are clearly struggling. The only debate for marine scientists is whether the harm is being done on a local or global scale
Can fisheries eliminate their debts to nature?
Our oceans are in trouble, says Nancy Knowlton. But it's not too late to do something about it
Forty years after the passage of the Clean Air Act, researchers have seen great progress while studying the dangers of pollution
A look at man-made and natural causes that are threatening the Earth
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