A follow-up to the post just below, which mentions a new International Energy Agency report predicting that America will surpass Saudi Arabia in the coming decade to become the world's largest oil producer.

How is this possible? The answer is 'fracking' or hydraulic fracturing, a method for extracting oil and natural gas that is booming in the US and has environmentalists worried. Hollywood too, it seems, with Matt Damon starring in a new film based around the theme of fracking. Judging by the tone of the trailer, I'm not surprised the oil industry is responding: