The Sundance Film Festival — at the vanguard of the environmental movement — is known for being the first to premiere eco-friendly films and documentaries. After all, it was here where Al Gore introduced An Inconvenient Truth to the world. And this year's festival, happening Jan. 15 - 25, is no different. Below are some video clips from the festival highlighting its green credentials. Sit back, grab a cup of joe, and enjoy.