INDIANAPOLIS -- The National Geographic Channel is promoting David Letterman’s return to television as a correspondent for climate change documentary series “Years of Living Dangerously.”

Letterman’s episode, in which he files a report from India, will air Oct. 30 as the second-season premiere for "Years of Living Dangerously."

During a visit to this year’s Indianapolis 500, Letterman said his time in India was “wall-to-wall overwhelming.”

Letterman said he didn’t know what to expect when he traveled to the world’s second-most populous nation and explored its plans to expand solar power.

“I think the entire world is in some peril, but they’re very optimistic about their future,” Letterman said.

In the episode titled “Into the Light,” Letterman interviews Indian Prime Minister Narendra Modi. National Geographic Channel released a behind-the-scenes video of Letterman’s chat with Modi, as well as a comedic clip in which Letterman rhapsodizes about solar panels.

After 33 years of hosting late night TV shows, Indianapolis native Letterman retired from CBS’ “Late Show” in 2015.

During his Indianapolis visit in May, Letterman said he’s sorting through TV memorabilia he’s pledged to donate to his alma mater, Ball State University.

“Mostly junk,” said the master of self-deprecation. “The poor folks at Ball State are going to end up with a load of my old crap.”

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