The 2012 Environmental Film Festival explores how the environment affects human health. On this 20th anniversary, 180 films will be screened at various venues. The Broken Moon, Switch, The Forest and its Friends, and You've Been Trumped premiere tonight with a special tribute to Kenyan Environmentalist Wengari Maathai. E Street Cinema/National Geographic Society/Martin Luther King, Jr. Memorial Library. The film festival runs until March 25.