BILL McKIBBEN & 350.ORG urge you to do the math, because they believe it shows we're running out of time. Bill also believes that it is time to organize to take on the fossil fuel industry. I believe he's right: HuffPost has a fine explanation of the urgency.
Anyway, Bill took his message on the road, in his "Do the Math" tour of the US. In printed form, it can be found at Rolling Stone. Heard it on PBS, but it seems elusive; below, is a version of same shot by an audience member at Duke, with reasonably good sound.
Americans are getting the message. Earlier today, a bunch held a "die-in" at TransCanada's Houston offices to protest construction of the Keystone XL pipeline. At least two arrests have been confirmed, according to 350's FB page.