text: The first advantage of limiting car usage is the effect it will have on the enviroment.  According to Source 1, "cars are responsible for 12 percent of greenhouse gas emissions in Europe...and up to 50 percent in some car-intensive areas in the United States".  All this polution and emission not only effects the enviroment but also leads to "intensifying smog"(source 2) wich is not only bad for the enviroment but also bad for people.  The use of cars may not be the only source of emmision, but it is "the second largest source of America's emissions"(source 4). Many cities have already realized this and have begun limitations on car usage.  Just think if all cities put a limitation on car usage how much fewer the percent of emissions would be and how great of an effect it would have on the enviroment.