text: Cars give of hazardous gases threw their exhaust. These gases will rise and get caught in the ozone. Which impacts the enviroment greatly in more ways than one. It can cause the air your breathing to be toxic. It also is one of the main reasons for "Global Warming". Paris learned this the hard when they reached a record level pollution. They decided they had no choice but to ban half the cars one day and ban the other half the next day. After this the congestion was down 60%, proving that it has helped greatly. Just imagine if one day instead of driving you could ride a bike and help change the eviroment.