Jeremy Leggett, oil geologist, claims that the world's rate of oil extraction will fall short of demand, sometime before 2020, perhaps as soon as 2015. He also says that a transition to renewable energy is within our grasp.

Unfortunately, the Koch Brothers and their pet politicians are working so hard to prevent the transition. A carbon tax is the way to speed it up, so we can migrate as fast as possible, rather than as slow as possible.