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Assume we move over to electric vehicles (like Tesla) as the default mode of transportation at some point in the future, will that solve this problem?

In other words, is our ability to generate electricity for all the electric vehicles more efficient and better for the earth than how we currently power them with gasoline?

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It won’t solve the problem without more change in power generation, but it will help. Even coal power plants are more efficient than small internal combustion engines. Gas power plants are vastly more efficient (double or more) and of course wind/solar/hydro/nuclear do not have carbon emissions.

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