His first TV appearance is about climate change….

David Letterman will return to TV next year to help draw attention to the effects of climate change when he appears on an episode of “Years of Living Dangerously.”

The National Geographic Channel series, which Thursday was renewed for a second season, has signed Letterman for his first announced appearance since leaving his job hosting CBS’ “Late Show.”

Fellow correspondents will include Ty Burrell, James Cameron, Don Cheadle, Arnold Schwarzenegger, Olivia Munn, Ian Somerhalder and Cecily Strong, among others.

Each will give first-person accounts of conditions at locations from across the planet where the effects of climate change are most prevalent.

“Years of Living Dangerously,” whose new season is scheduled for fall 2016, was last year’s Emmy winner for best documentary or nonfiction series.