But that's not all you can do. Park your car. Hell, sell your car. There are other cleaner, healthier ways to get around.
Public Transportation: Take the train or ride the bus! Because public transit is mass transit, less CO2 is released per passenger than in a car.
Walk or Bike: Zero greenhouse gas emissions! Plus, it's great exercise. If you don't own a bike there are great bike-sharing programs in lots of cities. This is the ultimate gasoline alternative -- it's a two-fer. Get a healthier planet and a healthier you at the same time!
