text: GreenHouse gass emission is a very known topic today. Car produce this gass which add to globel warming. Theren other thing that cause this like buring tree,fossil fueland other thing. But car are responsible for 50 percent of greenhouse as in U.S.,because car are the main way of transportation. If we limited our car uses like in Vauman how they only one road to get to a tran to ther downtown. If we could do that in america we could cut down our greenhouse emission by half.