Use the Boston College Libraries online catalog.
If Boston College doesn't own what you're looking for, try searching the WorldCat Database (BC Community only) using the same terms. WorldCat provides information on library holdings across the country and internationally.
Here is a very brief listing. For more films, search the catalog for "climate change*". Sort by date (upper right, above results), then filter on the left to limit to "Material Type" of Films & Videos.
An inconvenient truth [videorecording] /.
Who killed the electric car? [videorecording] /.
Journey to planet Earth. Extreme realities [videorecording] /. Public Broadcasting Service (U.S.) Washington, D.C.: Screenscope, Inc. 2014 O'Neill Library Media 7 day GF71 .J68 2014
Years of Living Dangerously: True Colors. [videorecording] /. Films Media Group, film distributor.; Years of Living Dangerously, production company. New York, N.Y.: Films Media Group 2014], c2014. Available Online (Films on Demand)