Leonardo DiCaprio visits various regions of the globe exploring the impact of global warming. As a narrator, DiCaprio comments these encounters as well as archive footages. DiCaprio repeatedly references a 15th-century triptych by Hieronymus Bosch, The Garden of Earthly Delights, which, he explains, hung above his crib as an infant, and which he uses as an analogy of the present course of the world toward potential ruin as depicted on its final panel. The film also documents, in part, the production of DiCaprio’s 2015 film The Revenant.
DiCaprio’s comments and inquiries focus extensively on climate change denial, mostly among corporate lobbyists and politicians of the United States.
They interview with British-born astronaut Piers Sellers, a NASA scientist who flew on three space missions, discusses his desire to publicize the perils of global warming in the short time he expected he had remaining to live, as he had stage IV pancreatic cancer as he was being filmed. He died on December 23, 2016.