text: The number of cars being purchased in America has been dwindling with each year that passes.  If this pattern persists it will have beneficial implications for carbon emissions and the environment.  This is due to the fact that transportation is the second largest source of America's emissions, just barely behind the power plants.  At one point in Paris, France, there was an extreme case of congestion which provided the air with more than its fare share of smog.  The city was told to momentarily stop the driving of motor vehicles.  Conjestion went down 60 percent after  five days of intensifying smog.  The smog rivaled Beijing, China, which is known as one of the world's most polluted cities.  By driving a car less the environment benefits emmecely.