“A new moment for mankind.” That was how Brazil’s former president, Luiz Inácio Lula da Silva, described his country’s biofuel boom in March 2007. Back then, Brazil was the poster child of ethanol fuel, its output second only to that of the United States. Fermenting the sugars in the country’s abundant sugar cane produced a motor fuel that lowered carbon dioxide emissions, and many saw Brazil as a model for how the world could shed its addiction to oil, creating jobs along the way.