Basically, our planet is becoming warmer little by little as a result of cumulative and larger amounts of smog in our environment. 1998 was the warmest year on record, and 7 of the 10 warmest years on record have occurred in the 1990s. Heating our homes, using air conditioners, and business operation all contribute to air pollution levels.
Transportation accounts for about one third of the pollution responsible for global warming.
Most people drive to work alone day after day after day, but we can choose to share rides in a number of ways, or we can find ways to use our cars less often. Our planet, over millions of years, has experienced periods of both warming and cooling. Scientists debate whether or not recent trends in global warming are caused by our modern society. Cars today are built to run cleaner than ever before. Gasoline is cleaner too, but the fact is that there are more cars on our roads than ever before.