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Randallw said:
ALthough it is true that human relics could be recycled for minerals, aLso consider oil. I do not know an exact figure, but say we have depleted oil supplies so that they will only Last another 50 years. ALthough our technology may well come up with an alternative power supply, a less advanced culture that develops after ours may find it difficult to have an industrial revolution if oil is sparse.
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What makes you think that human bodies won't rot and make more oil, given enough time?
Plus, the Industrial Revolution relied primarily on steam power; the world began using oil because it was an efficient means of making steam. Should Coal exist in the future (and it most certainly will, since even now, many coal deposits exist), the civilization that develops after ours will probably learn how to make do and to develop more stuff from coal, as we have with oil.