Mexico is the first developing nation to make its climate action pledge ahead of U.N. talks in Paris -- and it's actually pretty ambitious.
That's the word from a group of respected lawyers who've just introduced what they're calling the Oslo Principles.
This year's Arctic sea ice hit a new low.
City officials say the shift to 100-percent renewable energy is a way to save cash, not the planet.
Did the iPhone cleanse change my life? No. Was it difficult? Not remotely.
Utility companies claim solar-powered homes are raising everyone else's electric bills.
Scientist Ken Caldeira explains.
I'm sorry -- we need to talk about this.
The owner of a single-room occupancy building in San Francisco's Chinatown takes aim at good old-fashioned clothesline drying.
Greens hoped that Chief Justice Roberts would continue a recent green streak. Their hopes were just dashed.
We've devised the world's shortest survey to find out what kind of actions our readers are taking. You know you want to.