Depends on where you live. If Vermont, more than 90% of their grid is powered by renewables and other non carbon sources like nuclear.

Not to mention that the equivalent mpg for a Tesla is 100mpg.

Add to that the fact that mass produced grid electricity is massively more efficient and clean than everyone generating energy themselves. (ala internal combustion engine).

It would be like saying that everyone having their own gas generator at home is just as bad as having a single gas power plant that powers the grid.

Sure, there are other sources of pollution like the batteries but "all in", electric cars are still significantly better for the environment.