0%, as there is no proof of man-caused global warming. Manufacturing that many electric motors and (presumably) lithium ion batteries would have an enormous im

0%, as there is no proof of man-caused global warming. Manufacturing that many electric motors and (presumably) lithium ion batteries would have an enormous impact on the world, though, in terms of mining and refining the rare metals and elements required for these components. But even putting that aside, and assuming that batteries and motors could be produced for the same impact as combustion engines, the impact would still be zero percent for there is no provable scientific evidence that man is causing global warming. None. There are lots of theories, yes, and loads of simulations, stacks of papers written with funding by government grants, lots of charts & graphs (some with well-documented NOAA 'doctored' numbers), plenty of groupthink in the popular press, etc. but science is not a popularity contest. At one point in time it was settled-science that the world was flat. Groupthink does not equal proof. And it should not be actionable. This lack of proof is the state of scientific knowledge at this time.