text: A study last year found that driving by young people decreased 23 percent between 2001 and 2009 in the united states. Bogota, Colombia even becan a "car-free day" in wich all cars, besides busses and taxis, are banned in this capital city of 7 million for an entire day. Violaters of this ban are fined $25. "It's a good opportunity to take away stress and lower air pollution," said businessman Carlos Plaza. This event is even starting to spread. For the first time two other Colombian cities have joined the event. Using cars is becoming less and less common, and it's a trend the enviornment can enjoy.