Cars are not widly choosed over walking because things are to close and with less people driving less co2 emissions with is cutting back on the green house effect. 12% of co2 emissions are from cars and passenger vehicals. David Goldberg says '' since world war II transportation id growing quickly. Do to cars and there emissons pair has put a ban on them till the smog they have created clears up. Cold nights and warm days cause the emissions to get trapped in the air. Obama wants to put curb on the cor emissons and all the pollution that its causes. The united syates has long been the prime culture for cars do the birth place of the model T was in Detroit. Cars seem to be the big thing in the united states. Number of miles driven have grew scence 2005. Resources are getting closer and closer every day having none. The united states leads in car emissions.