CO2 emissions from transportation aren't the big, bad bogeyman of the era. PEAK OIL may be the thing that will 'fix' it. As well as 'globalization'. I don't drive a Prius to 'save the world' from pollution. In the short term, until all of those electric cars come online and are affordable, my Prius acts as insurance against spiking fuel prices. If I can maintain my 60MPG fuel economy, then transportation will remain affordable, even if gas creeps up to $10 a gallon. And that's not only entirely possible, it's not as high as fuel prices can go. This little 4-part video is an absolutely fantastic primer on PEAK OIL, at least after the first two minutes of introduction. Jeff Rubin explains Global Peak Oil and some of the global impacts it is already having. If we import half our petroleum from overseas tyrants, then I will be content to burn the 'other' half that is still produced here and be 'powered by America'. At least until I can afford a real electric car.