The biosphere is made up mostly of six atoms that almost all organic life is made out of, and trace amounts of the rest of the periodic table. Most of the nickel and the chromium and the iron are bound in rocks way deep underground, far away from the biosphere. We're undoing what took billions of years to make, which was the right elemental constituents for a healthy biosphere. So either we have to make our built world mostly out of the same elements that nature makes stuff out of, or if we're going to use other elements, we have to figure out how to have close loop, atomic cycling on them. And where those processes that we create we can insure

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