Here is a list of climate change related videos from Jim Hansen, who is considered the world’s leading (or equal) scientist on climate change.
James Hansen concerned IPCC ignores danger of ice sheet melt
http://www.youtube.com/watch?v=Z3oMf_WnaA8 James Hansen talks about the Urgency of the climate crisis
http://www.youtube.com/watch?v=f0hHlxaYNb0NASA Chief Scientist James Hansen talks about climate change.
to the Global climate change summit
http://www.youtube.com/watch?v=uUohLJ8bMxc
James Hansen on White House censoring of Global Warming
http://www.youtube.com/watch?v=jc4OzpgTOhk