Wear the Cheeseburger Footprint T-shirt and scare your friends into eating healthier, greener fare.

This often-overlooked global warmer is worse than CO2, and the amount of it in our waterways is increasing.

The government will clear France's beaches of thousands of tons of noxious seaweed that's emitting dangerous fumes.

Teaching farmers in developing countries sustainable methods could decrease hunger, poverty and emissions.