text: To start off, if citizens limit their car usage, there would be less gas emissions. But, unfortunately there are still plenty of greenhouse gas emissions. Transportation is the second largest source of America's emissions, just behind power plants. There are other options to do instead of driving, you could skate, bike, walk, or etc. The gas emissions are a huge problem in today's society and we have to change something about the way we live. For example, in Bogota, Columbia, they have a car-free day once a year.  This reduces the smog that is kept in the air from the gas emissions.