Fuels. Cars run on gasoline, which when in mass amounts can lead to air pollution. If cars don't run on gasoline, it MAY be safe, but even electric cars are bad for the economy.
You see, in order to produce electric cars and their batteries, they go through a special process. For the batteries, you need a specific type of mineral/ore, and the machinery required to get this causes MASS amounts of pollution
Also, when the mineral is taken to the factory to be used in the batteries, the plants that DO this process spit out C02 in MASSIVE amounts, more than double than what's needed to produce a normal car. The power plants are needed to CHARGE the cars. This, in turn, means that in the process of making an eco-friendly car, we are REALLY hurting our environment more than twice as much.
So, if they figure out a way to avoid all of this, THEN we will TRULY have an eco-friendly car.
