The energy used to mine metals, to forge steel, to move parts and people around, the production needed to sustain settlement happens on earth, not in space. Any

The energy used to mine metals, to forge steel, to move parts and people around, the production needed to sustain settlement happens on earth, not in space. Any significant program to live outside earth will require investment never seen before on the ground. If this investment is done using current tech, the impact on carbon emissions won't be sustainable. It doesn't mean we should not do it, but a clean source of energy is a prerequisite to a successful space settlement.