20 years ago, ecotourism was promoted as a way to save natural systems, and the people who lived in them. We ask: Is ecotourism a force for good, or just another form of “greenwashing”?

Measurements show a huge ozone hole. How can this happen? We thought ozone-destroying chemicals were being phased out…

Is global warming feeding hurricanes? Global warming has already raised sea levels. Is warming also making hurricanes like Katrina more intense? Some new evidence says yes.

As the administration allows more snowmobiles to buzz through Yellowstone, scientists cry foul. Are the parks more than playgrounds?m Scientists call for more money for basic research, but the Bush administration favors recreation.

How should we deal with mercury air pollution in air, fish and water? Why do the studies of mercury consumption not agree? What to do when the studies conflict…

Marine iguana in the Galapagos islands are suffering from trace amounts of oil left by a tanker accident.

Water shortages loom as world population and economy soar. American Southwest, Egypt, Iraq, China. People are getting thirsty pretty much around the world. How does this matter?

Shrinking resources on Earth: Want to try living without fish or chocolate?