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I think its basically about "time". If nature can relace something in a reasonable time its renewable, if it takes an unreasonably long time its nonrenewable. So Ethanol from corn is renewable because you get a new crop every year. Wood from trees is probably borderline because it takes 20 -30 yrs to grow a new tree. And coal is nonrenewable because it takes nature millions of yrs to make coal.

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16y ago

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