River health: Finding fixes

River health: Finding fixes

Can we fix rivers? Dams, levees, and locks can harm rivers and wetlands. So can draining rivers dry, or encasing them in concrete. In a More »

State of the rivers: Ruinous?

State of the rivers: Ruinous?

Rivers bring water. They house amazing biodiversity. And they are being polluted, tapped, dammed and diverted at a frightening rate. More »

Tar sands = Clean oil?

Tar sands = Clean oil?

Canada’s oil-drenched sands are the second-largest oil reserves, but they pollute air and water, destroy forests and boost warming. A More »

Fertilizing the ocean

Fertilizing the ocean

As Earth warms, should we try huge geoengineering projects to cool the climate? Would adding iron to fertilize ocean plants withdraw More »

Bush creates huge Pacific reserves

Bush creates huge Pacific reserves

Three giant new reserves, extend 50 miles out from shore, will protect coral reefs, fish, clams, and other life forms. But how More »

The Value of Wilderness

The Value of Wilderness

Woman is rescued in wilderness after 5-week ordeal. What is so great about wilderness, and why do so many people think they need it? More »

Ecotourism: Is it Working?

Ecotourism: Is it Working?

20 years ago, ecotourism was promoted as a way to save natural systems, and the people who lived in them. Is ecotourism good? More »