If you have access to Netflix, I definitely recommend watching GMO OMG. It is a story of a father and his family on their path to investigating and eliminating GMO from their lives. I knew a lot about GMO already, but this film comes packed with new research and data that opened my eyes.
Another suggestion is Vanishing of the Bees. This film showcases the demise of bees possibly due to systemic pesticide infused seeds that cause CCD (Colony Collapse Disease). This is causing about 30% of Americans bees to die every year.
My final suggestion is Dam Nation. An eyeopening film about the havoc that dams cause to the environment and a group of individuals that are campaigning to have moot dams removed and the magic that happens when they are. At the close of this film, I felt warm inside and highly recommend this watch.