But we didn't, for example, first test vaccines on the entire world population simultaneously. The scale of the potential initial risk is critical. Not "what co

But we didn't, for example, first test vaccines on the entire world population simultaneously. The scale of the potential initial risk is critical. Not "what could happen?" but "If there's an unintended consequence, how many people (or how large of an area) could it affect? I think in the case of the solar shields, the risk is beyond what most of us can comprehend.