Dr. Oppenheimer agrees. He says that producing electricity by burning coal is the first largest contributor of global warming emissions. The next biggest chunk is from driving gasoline-fueled automobiles. In fact, cars are responsible for more than one-third of all greenhouse gas emissions.
It's estimated that Americans use more than 380 million gallons of gas every day. According to experts, if everybody bought the most fuel-efficient car available, the United States would save approximately 1.47 billion gallons of gasoline each year!
So what are the most fuel-efficient cars on the market today? Three hybrid cars: the Honda Insight, Honda Civic Hybrid, and Toyota Prius. What are some different options besides buying a hybrid car? Cars like the Ford Focus, Toyota Eco, or Chevy Aveo get great gas mileage and emit fewer emissions.