Just five years ago, Brazil's mostly "green" energy landscape was the envy of nations dependent on dirtier sources of power and the pride of a government that believed it was leading the country to economic superpower status.

Three-quarters of electricity came from renewable hydro power and the main automobile fuel was home-grown sugarcane ethanol. Plus, Brazil had just found massive oil fields off its coast, putting it on a path to become the world's No. 3 oil producer after Russia and Saudi Arabia by 2020.

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