A new study suggests the life may have evolved all over the place a few billion years ago, but only Earthlings survived.
He called out the "corporate greed of the coal, oil, and gas industries" in his acceptance speech for the Crystal Award.
Piers Sellers wrote about his diagnosis. Climate deniers went after him.
Last year was the hottest year ever recorded, by a long shot.
Sanders joins Iowa farmers in opposing a pipeline that would ship crude oil across the whole state.
New fossil fuel projects keep emerging from the ground. How can we stop them?
The U.S. Forest Service's strategy for fighting fires might be making the problem worse, some groups argue.
The president intends to change the way coal is managed on public lands, but it'll be up to his successor to carry the reforms through.