text: Source 3: "Car-free day is spinning into a big hit in Bogota" , by Andrew Selsky is exciting. Lastly i would like to state , you can have fun with not having a car bringing together your community. In a program millions of Columbians hiked , biked , skated , or took buses to work during a car-free day. "It's a good opportunity to take away stress and lower air pollution , " said businessman Carlos Arturo Plaza as he rode a two-seat bicycle with his wife. Parks and sports centers also have bloomed and new improvements have been made everywhere. Source 4: "The End of Car Culture" , by Elisabeth Rosenthal explains the greenhouse effect also , and the change it's had on the economy.