I just discovered the American Museum of Natural History website. The Science Bulletins section features amazing animations and videos on the Universe, Space, and Earth. It's worth bookmarking, sharing, and, of course, watching here.
In the Earth section, the following three presentations are mandatory : Dead Zones on the Rise, Melting Glaciers: Clues to Climate Change, Arctic Sea Ice 1997-2006
Maybe those of you who are still skeptics about global warming will change their mind. Hopefully ;-)