James Hansen

Western Antarctic ice sheet

A prominent scientist says the just-reached COP21 target for climate change may be unrealistic

Environment

Back in the 1970s, NASA scientist James Hansen was one of the first to recognize the dangerous impacts that rising levels of greenhouse gas emissions could have on Earth’s climate. Now this climate scientist has become an activist in the climate movement, lending his scientific voice to calls for urgent action.

Scientists

‘Merchants of doubt’ looks at ‘experts’ peddling junk science to the public

Science

20 Years of Urgency

Gagged Climate Expert