text: Adittionaly, greenhouse gas emissions are crazy.  Americans are buying fewer cars, driving less and getting fewer drivers licenses as each year goes by. But America's love afair with its vehicles seems to be cooling. If the pattern persists-and many sociologists believe it will- it will have benificial implications forr carbon emissions and the enviroment, since transportation is the second largest source of America's emissions, just behind power plants. There has been a large drop in the percentage of 16-39 year olds getting license.                                    Car Free Cities