Though the San Francisco Green Film Festival doesn't kick off until the end of May, you'd be very silly to think that they'd let Earth Day slide by without some sort of event. Tonight, join them and the SF Public Library for a screening of Watershed: Exploring a New Water Ethic for the New West, a Robert Redford produced and narrated documentary on "the threats to the once-mighty Colorado River."

Bay Area filmmaker Mark Decena wrote and directed Watershed, which poses Earth-Day appropriate questions like "Can we meet the needs of a growing population in the face of rising temperatures and lower rainfall in an already arid land? Can we find harmony amongst the competing interests of cities, agriculture, industry, recreation, wildlife, and indigenous communities with rights to the water?"

And the answers are not as depressing as you might think! It's actually a pretty inspiring film, not one of those docs that makes you think "screw it, I'm just going to stay in bed and eat bacon and Oreos." Watch the trailer below to see what I mean:

Tonight's screening will be followed by a discussion with Jill Tidman, Executive Director of the Bay Area based Redford Center, which co-produced this film.

What: Watershed: Exploring a New Water Ethic for the New West
When: 6 PM
Where: San Francisco Public Library's main branch (100 Larkin Street), in their Koret Auditorium
Cost: free