Mashable: After three decades on late night television, David Letterman is tackling a brand new job: globe-trotting climate change correspondent.
The comedian and former Late Show host has joined the cast of Years of Living Dangerously, the Emmy-winning series covering the serious impacts of climate change all over the world.
The series' first season previously aired on Showtime, but it will now gain a much larger audience at National Geographic.
Letterman will serve as one of many celebrity correspondents...