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In page The Green Paradox:

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Sinn emphasises that a condition for the green paradox is that the resource be scarce in the sense that its price will always be higher than the unit extraction and exploration costs combined. He claims that this condition is likely to be satisfied as backstop technologies will at best offer a perfect substitute for electricity, but not for fossil fuels. The prices of coal and crude oil are currently many times higher than the corresponding exploration and extraction costs combined.[citation needed]