text: "BOGOTA, Colombia-In a program that's set to spread to other countries, millions of Colombians hiked, biked, skated or even took buses to work during a car-free day yesterday, leaving the streets of this capital city eerily devoid of trafic jams."(Source 3, paragraph 20). These simple and energizing activities can get you to where you need to be and also gets and keep you active and moving. "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."(Source 3, paragraph 24). "Different things are converging which suggest that we are witnessing a long-term cultural shift, " said Mimi Sheller, a sociology professor at Drexel University and director of its Mobilities Research and Policy Center."(Source 4, paragraph 35). The world is changing and with it the health of the people and the condition of the environment.