350.org founder Bill McKibben lays out the case for the need to get back to 350 ppm carbon, to which Letterman says "Thank you, Bill, for scarin' the crap outta me." He also talks about the momentum building for 10/10/10, and announces the upcoming road trip to take one of President Carter's original solar panels back to the White House
For more information: http://www.350.org/letterman
