Unfortunately, they still make some pollution. The electricity to recharge electric cars comes from powerplants. Powerplants are like factories that make energy for a whole city. A few powerplants make energy from the wind or sun, but most don't. They say that the most harmful activity is the use of cars and light trucks.
Cars use up a lot of space.
Cars use freeways for fast driving, regular roads for slower driving, parking lots and parking garages. In a typical city, every car has an average of eight parking spaces. The next time you walk to school, look around your neighborhood at all the space cars use. One reason kids in some cities don't ride bikes very much is that there are so many cars. Parents worry that the cars will hit their kids.