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By the time the third world gets around to mass producing gasoline powered cars, electric cars will already be way more economical. Arguably, they are already.
You seem to be complaining that if cutting US pollution doesn’t stop all pollution, than it is not worth doing. Surely you will admit that even cutting pollution 10% has a real effect on slowing global warming, and definitely serves as an example to the rest of the world.
It serves as an example not only that we did do it, but also it serves as an example of how the rest of the world can do it. The world can be inspired by our example, but also learn from it.
