Ice and the Sky

Ice and the Sky is a 2015 French documentary film directed by Luc Jacquet about the work of Claude Lorius, who began studying Antarctic ice in 1957, and, in 1965, was the first scientist to be concerned about global warming. The film was selected to close the 2015 Cannes Film Festival.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.