text: Additionally, the environment suffers greatly from the many car emissions let out on the roads. "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" (Source 1). This alone should be enough to horrify anyone out of such copious amounts of car usage. If that were not enough, "transportation is the second largest source of America's emissions" (Source 4). It is clear that cars are only doing more harm to this earth all humans live on and happen to only have one of, so there is no need to continue on knowing this without changing something about that. Even car-pooling could significantly reduce emissions as there would be less cars out there, which is possible through "more flexible commuting arrangements, including the evolution of shared van services for getting to work" (Source 4).