Something I didn't mention
I think the guy in the video's point is that instead of just 1 facility polluting the air in japan making the engines and vehicles, they now have to increase the pollution output and energy necessary to build each vehicle. There aren't just sheet metal and engine components, now we have a whole 'nother facility making specialized batteries and electrical equipment for the vehicles too. So while the cars are on the road conserving energy, and reducing smog in LA it really "doesn't out weight" the overall production energy deficiency and pollution overseas.
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