Pessimistic forecasts say that there is only enough coal for 450 years, enough natural gas for 50 years and that oil might run o

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问题 Pessimistic forecasts say that there is only enough coal for 450 years, enough natural gas for 50 years and that oil might run out in 30 years.

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答案不乐观的说法是,煤的储量只供450年之用,天然气只满足50年之需,而石油只能用30年。

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