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Well, in that vein, there are many light weight solar powered “cars”. Some formula of solar panels don’t use much of rare/bad materials, and salt batteries are already a thing, so certain constructions wouldn’t need to climb much of a hill to become a net-positive.
Well, in that vein, there are many light weight solar powered “cars”. Some formula of solar panels don’t use much of rare/bad materials, and salt batteries are already a thing, so certain constructions wouldn’t need to climb much of a hill to become a net-positive.