Two main reasons are:
- EV's are powered by electricity - which is produced for cars just as it is produced for everything else. Depends on what fuel is used by the power plants in your area.
- Today's cars are much better re: the environment than they used to be - "Today’s vehicles emit only about 1% of the pollution than they did in the 1960s, and new innovations continue to improve those engines’ efficiency and cleanliness."
But . . the issue is still debated. Here is an article that says EV's are better for the environment than today's gasoline-powered cars.
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