Here's a terrific billboard from Draft FCB Toronto for the World Wildlife Fund.
It's the kind of thing that should do well at award shows -- in use-of-media cateogries as well as traditional out-of-home categories.
Using the sun to create shadows, it reminds me of this McDonald's billboard I wrote about a while ago. But while the sun is just a gimmick in the McDonald's board, it is central to the global warming discussion. Very smart.

