text: One reason that we should cut back on car use is because of the green house gases going into the air. In Europe passenger cars are why 12% of green house gases arer from there. But the U.S. is even more responsible for the woping 50% in somer areas here. So if you were to cut back here that would be a good thing so you can cut back on the pollution. I bet if you were to use bikes instead of cars it would cut back on the 50% of green house gases here. For example take a look at NewYorks bike-sharing program helped out the mobile world so think about it.