text: Limiting car usage can also have beneficial implications for carbon emissions. If we created cities with pedestrian, bicycle, private cars, it can lower emissions and if the emissions are in good care then the environment will be to, "since transportation is the second largest source of America's emissions, just behind power plants." President Obama has goals to curb the United States greenhouse gas emissions. Experts say" Is a huge impediment to current eforts to drastically reduce greenhouse gas emissions from tailpipes..." according to the article In German suburb, Life Goes on Without Cars, by Elisabeth Rosenthal she says" Passenger 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. So thats pretty bad so if we limit car usage we can help fix that and maybe even have a lower percentage on emissions.