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There are only 5.5. x 10^12 metric tonnes of fossil fuels that can be used as a useful resource existing on Earth. Assuming an estimated rate of fossil fuel use of 1 x 10^11 metric tonnes per year, calculate an order of magnitude estimation of the time left before the fossil fuel reserves run out.
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There are only 5.5. x 10^12 metric tonnes of fossil fuels that can be used as a useful resource exis...
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