I think electric cars must be the future.
Maybe, but remember that electricity doesn't come from nowhere. It must be GENERATED, which is the purpose of hydroelectric dams, coal fired steam-driven generators, and nuclear powerplants. Solar would be nice, but is there a technology that is ready to meet the future? I'm not sure there is, yet.
Of course we could alsways go back to horse-drawn transportation, and once again the city streets will be hip-deep with horse pucky. This was one reason the coming of the gasoline-fired automobile was so widely hailed. It solved a very tangible pollution problem.