A third of the U.S. food supply depends on commercial beekeepers for pollination, but since 2006 the bees have been disappearing at staggering rates worldwide. The phenomenon, known as colony collapse disorder, remains unexplained, though one study attributes it to a combination of viral and fungal infections.

One of several documentaries on the subject, Vanishing of the Bees, explores potential environmental causes and alternative agricultural practices that might help address the issue.