From Wikipedia
The Age of Stupid is a 2009 British film by Franny Armstrong, director of McLibel and founder of 10:10, and first-time producer Lizzie Gillett. The Executive Producer is John Battsek, producer of One Day in September.
The film is a drama-documentary-animation hybrid which stars Pete Postlethwaite as a man living alone in the devastated world of 2055, watching archive footage from 2008 and asking "Why didn't we stop climate change when we had the chance?"