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I thought it was at least 200. According to the Wikipedia article on coal, an estimate from British petroleum is 155 years. I don't know under what assumptions this was made, if we don't just adjust for economic growth but also assume that coal should substitute for oil and gas when those run out, it would become less.
by nanne (zwaerdenmaecker@gmail.com) on Sat Oct 14th, 2006 at 08:19:03 AM EST
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