When Charles Dudley Warner said “Everybody complains about the weather, but nobody does anything about it,” he was joking, but he might as well have been talking to people living in the era of global climate change. The problem is huge and often looks insurmountable, but This Changes Everything, a new documentary premiering at the Toronto International Film Festival, aims to change that.

Inspired by the nonfiction bestseller by Naomi Klein, the film attempts to humanize the problem by looking at the people living on what amounts to the front lines, visiting locations like the Alberta tar sands, Montana’s Powder River Basin. polluted Beijing, South India, and more, while also drawing connections between the problem of global warming and economic systems that facilitate it. The official trailer is out now and you can watch it here.

Shot in nine countries on five continents over four years, it’s executive produced by Alfonso Cuarón, Seth MacFarlane, Danny Glover and Shepard Fairey, directed by Avi Lewis (The Take, The Shock Doctrine), and narrated by Klein. This Changes Everything will have its world premiere Sunday, September 13th at 2:45 PM at the Ryerson Theatre, followed by additional public screenings on Wednesday, September 16th at 2:00 PM at The Bloor Hot Docs Cinema, and Friday, September 18th at 11:45 AM at Cinema 1. Press and industry screenings will happen Thursday, September 10th at 12:30 PM at Scotiabank 2, and Thursday, September 17th at 12:15 PM at Scotiabank 10.