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Would have? We don't have to guess; carbon taxes for automobiles have been widely implemented, especially in Europe. The result was largely growth of diesel-engined vehicles, which have slightly lower CO2 emissions at the cost of higher upfront costs and worse emissions of other pollutants.

Directly funding R&D on electric vehicles has produced better results. Yes, it's distasteful to use income tax policy to subsidize sports cars for millionaires. But if this was the politically possible way to get car-sized batteries built affordably, it was worth it.




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