Question 1: Vehicles will always cause green house gases.

Vehicles in the near future, will be fuel efficient, zero emission, and use high tech electronics and software to assist drivers in a variety of ways. Vehicles will communicate with each other, with the road and with traffic signals. Autos and trucks of the future will use vision enhancement devices to help you navigate through bad weather, let you see around them, or warn you of a possible collision with a pedestrian or animal. They will also let you know if you are getting drowsy or straying from your lane.
In twenty years, cars of the future will be different than the automobiles of today, and so will the driving experience.