Wake Up, Freak Out, Then Get a Grip is a short animated film about the feedback loops likely to lead to catastrophic climate change, by Leo Murray.
It turns out that the way we have been calculating the future impacts of climate change up to now has been missing a really important piece of the picture. It seems we are now dangerously close to the tipping point in the world's climate system; this is the point of no return, after which truly catastrophic changes become inevitable.
The script, with extensive peer-reviewed references and additional information and links, is available at wakeupfreakout.org.