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Wind and solar require steel, which is made with coal and/or natural gas to create using the Bessemer process, BOS, and other standard steelmaking practices. How do you get around this?

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    Get around this? - You don't, not fully. But it's not as if there is no steel/coal/gas left, or that pollution and resource usage has to go down to absolute zero. – user2451 Sep 5 '17 at 7:35
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    This is rather hard to answer unless you can edit in an explanation of what you mean by "sustainable" in this context. Do bear in mind that sustainability is a continuum, not a binary yes/no thing. – 410 gone Sep 5 '17 at 8:50