James Hansen
James Hansen.

It might be hard to imagine how James Hansen could do more to help the climate cause than he’s already done. A well-respected climate scientist, he’s been more outspoken than virtually all of his peers on the need for climate action. He first warned Congress about the threat of global warming way back in 1988, and he’s been sounding the alarm with increasing urgency ever since. During the George W. Bush administration, his outspokenness irritated his superiors, so they tried to muzzle him — an effort that backfired when Hansen went to The New York Times with the story. In 2009, he started getting arrested at climate protests, including protests against the Keystone XL pipeline.

But Hansen wants to do even more. And to do it, he’s quitting his high-profile, influential day job. He will step down tomorrow as the head of NASA’s Goddard Institute for Space Studies after 46 years spent working there.