In his recent book "The revenge of Gaia" James Lovelock, founding father of the Gaia Hypothesis, has an interesting different perspective on the (lack of) possibilities for biofuels to replace fossil fuels: "even if these natural products were used only for transport,...,it would require us to burn every year about two to three gigatons of carbon as bio fuel. Compare this quantity with our yearly food consumption of half a gigagton; to grow this much already uses more than may be safe"
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