The 6.1 billion people on earth in 2000 owned 735 million vehicles. Imagine what would happen if all the countries on earth ever achieve the same vehicle-ownership rate as the U.S. in 2000: there would be 4.7 billion vehicles even if the human population does not increase.... If there are four parking spaces per car (one at home, and three more at other destinations), 4.7 billion cars would require 19 billion parking spaces, which amounts to a parking lot about the size of France or Spain. More cars would also require more land for roads, gas stations, used car dealers, automobile graveyards, and tire dumps.
