Overall, the U.S. transportation sector accounts for 33 percent of U.S. carbon dioxide emissions and highway fuel consumption for 20 percent.13 Other greenhouse gases from the transportation sector such as methane, nitrous oxide, and hydrofluorocarbons contribute an estimated 23 million metric tons of carbon equivalent,14 which is equal to about 5 percent of transportation carbon dioxide emissions.15 The remaining two thirds of U.S. emissions are attributable mainly to the industry and to industrial and commercial buildings and the energyusing devices they contain; this includes emissions from the generation of electricity, nearly all of which goes to the industrial and buildings sectors. The numbers show that U.S. greenhousegas emissions cannot be sufficiently reduced by focusing on motor vehicles alone, but neither can they be sufficiently reduced without a significant effort in the transport sector.
We will have solar energy as soon as the utility companies solve one technical problem -- how to run a sunbeam through a meter.
