Lead buildings do give some credits for material salvage and reuse. There are companies that have actually made a living out of tearing down old steel structures salvaging the steel and reusing it Steel is a very highly recycled material in fact there's some projections in the future not too far off that we won't even need to mine anymore steel, he says. "We're good at metals because we see the value" he adds. 'If you can intercept concrete before it's even ground down you can get an absolute assload of it for free to build with'

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