Well the first step would be to drive cars without gasoline, everyone would have to rely on electric cars fed by batteries. Now batteries are expensive and take long time to recharge. But first, selling the car with the battery is like selling the gas car with gasoline to run for years. Second, batteries can be changed very rapidly if the proper infrastructure is put on place. So this is the reasoning that Shai Agassi developed a few years back, he and his company Better Place raised several hundred milions, and now they are on their way to make Israel the first country where cars do not need oil.