Need to Plant 1.2 Trillion Trees

An ambitious ecologist thinks he may have discovered the secret to neutralizing CO2 emissions on planet Earth. According to his findings, we need to start planting more trees — 1.2 trillion, to be exact. Considering how serious of a problem climate change is right...

Things You Might Not Know About Recycling

Last Earth Day, I published a column in the Washington Post on common recycling myths. I received so many comments and emails in response, often asking additional questions, that I wanted to follow up with a new list here at National Geographic. The...