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This certainly doesn't mean we should stop developing bio-diesel. Much bio-diesel is grown on land that is too marginal to support food crops. Moreover, bio-diesel and bio-ethanol, both refined from biomass, are renewable, clean-burning fuels; biodiesel fuel has lubricity that actually extends the life of diesel engines. And unlike hydrogen, biofuels can be stored and distributed using existing infrastructure.
Moreover, biofuel crops are basically converting sunlight into energy. As such, in future years it's possible biofuel crops may be developed that can more efficiently convert sunlight into biomass, creating potentially far higher yields.
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