The project is Letterman’s first on-air showing since he left Late Night in 2015.
The series, now in its second season, features celebrity hosts who are dedicated to fighting global warming. Producers of the series David Gelber and Joel Bach said they sought out Letterman because they could see his enthusiasm talking about clean energy and felt “he’s definitely invested in this issue.”
In his episode, Letterman will travel to meet with India’s Prime Minister Narendra Modi and other important figures to talk about making clean energy a reality.
“My goal here is a conversation. Containing several points both personal and with regard to environmental issues and climate change,” Letterman said in a behind-the-scenes video, as he prepares to interview.