I’ve worked on a few pro-social and environmental video campaigns, trying to bring across a message that no one really wants to hear. So I know it’s not easy to come up with something efficient, let alone creative. Because in the end, the client just wants to show polar bears or big lumps of ice falling into the sea. 
But this film-slash-installation by director Tim Godsall tackles that challenge pretty well, me thinks.

And a YouTube link, just in case the Quicktime version is taken down at some point.