If oil is over, what's on the horizon? Photo: house.gov They may be hyped as the way of the future, but biofuels already count as a juggernaut. Supported by the government and embraced by the Big Three automakers, ethanol is surging in the United States. Biodiesel, meanwhile, is roaring ahead in Europe as the continent strives to meet its carbon-emission obligations under the Kyoto treaty. But as we plunge headfirst into a sea of biofuel -- both in the energy-hungry world and in this Grist special series -- it's worth looking back at previous energy transitions to gain insight into …
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