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NancyLebovitz comments on Open Thread, December 2-8, 2013 - Less Wrong Discussion
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Garbage dumps would have metal that's more concentrated than you'd find it in ore. I'm not sure how much energy would be needed to refine it.
If I were writing science fiction, I think I'd have modest tech-level efforts at mining garbage dumps in coastal waters.
The History of the Next Ten Billion Years-- a Stapledonian handling of the human future. Entertaining, though I think it underestimates human inventiveness.
Aluminum, in particular, is known for being very difficult to extract from ore, but once extracted, very easy to recycle into new products.