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Maybe it's 3 or 10 or 40 or more. But if you imagine that biofuels are free non polluting don't harm brown people and unicorns then you are huffing paint again.
BTW Rads, Income distribution in oil free Brazil is even MORE uneven than in the US. In Brazil there are a few obscenely weathly, a tottering middle class trying to hang on, and a huge underclass.