Despite the challenges last year, global production of biofuels grew from 27.9 billion gallons to 31.4 billion gallons, according to a report from Clean Edge. "2012 was a year of extreme uncertainty for clean energy markets, as venture investors pulled back and high-profile bankruptcies became a partisan wedge in the presidential election, all while climate disruptions brought clean tech back into the limelight," said Ron Pernick, Clean Edge managing director.

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