Here are some titles of films about sustainable food production and things related:
http://www.ted.com/playlists/55/the_joy_of_eating.html - various TED talks about food
Dirt (2009): Talks about the science of dirt and importance of good dirt as a natural resource.
Growing Cities (2013): SMU library has this. About urban farming in America and implications of food ownership.
2012 Time for Change (2010): An eclectic searching movie that covers many eco-cultural topics, goes to a range of interesting speakers, and leaves one feeling hopeful and capable of creating a flourishing present.
A Community of Gardeners (2012): Focuses on Washington, DC, community gardens as centers of calm and social interactions in inner-city neighborhoods.
Canned Dreams: what people, places, and animals go into a can of ravioli
Food Inc: industrial food industry focused
Food Matters: health focused
Forks over Knives: health focused
Ingredients (2009): Focused on the local food growing movement and sustainable farming.
The Power of Community: How Cuba Survived Peak Oil: hopeful; culturally and economically focused
The Garden: South Central Los Angeles farmers fight to save their huge community garden in a poor urban area
The Garden at the End of the World: social justice and permaculture efforts in Afghanistan
Vegucated: New Yorkers go vegan as a challenge