This Woman Paddled All 730 Miles of the Green River

In the new book "Downriver," Heather Hansman paddles the length of the Green River—the biggest tributary of the Colorado River - in an attempt to understand the fight overwater, and what's going to happen to those battles in a hotter, drier, more crowded future.

The Maldives: Paradise Lost?

The archipelago off the coast of Sri Lanka is quickly becoming the Dubai of the ocean, but at what cost?

Climate of Terror

A mix of powerful landowners, cartel hit men and unsolved killings has made Mexico one of the most dangerous place in the world for environmentalism.