[Robotbeat]

Ethanol mandates really kicked off in the W administration. I think it's worth remembering that at the time, the primary motivation was probably more geopolitical than climate: ethanol is domestically produced, as are many of the energy inputs (such as electricity and natural gas). The US now produces a non-trivial amount of ethanol, enough that if it were removed from the market, we'd probably import significantly more foreign oil.

But I digress.