Cars can be useful in getting people from point A to point B but do they cause stress on the environment? Limiting car usage can lower the amount of greenhouse gas emissions.

In Vauban, Germany residents have given up their vehicles. Street parking, driveways and home garages are generally forbidden in this experimental new district. Car ownership is allowed but there are only two places to park in a large garage at the edge of the development where a car-owner buys a space for $40,000, along with a home. This results in 70 percent of Vauban's families do not own cars, and 57 percent sold their car to move there.(source 1)

After a number of day of pollution, Paris enforced a partial driving ban to clear the air of the global city. Mondays motorists with even-numbered license plates were ordered to leave their cars at home or be fined 22-euros the same for odd numbered plate the following day. The cold nights and warm days caused the warmer layer of air to trap car emissions. The smog cleared enough monday for the ruling French party to rescind the ban for odd-numberd plates on Tuesday.( source 2)

Bogota, colombia millions of Colombians hiked, biked, skated, or took buses to work yesterday. It was the third year cars have been banned with inly buses and taxis permitted on the Day Without Cars in the capitol city of 7 million. "It's a goos way to take away stress and lower air pollution," said businessman Carlos Arturo Plaza as he rode a double seated bike with his wife. The day without cars is part of an improvement campaign that began in the mid-1990s.

Limiting car usage can lower greenhouse gas emissions.