Carbon monoxide which is formed by the combustion of fossil fuels such as gasoline.

Diesel engines are more fuel efficient overall and they produce less greenhouse emissions than unleaded vehicles.

Cars leak no matter what. The harmful chemical that leaks from these vehicles are very dangerous. Carbon monoxide is a dangerous gas. Power steering fluid, antifreeze, and brake fluid are all dangerous liquids.

There are six different clean alternatives to gasoline and Diesel engines. Ethanol, biodiesel, propane, electricity, hybrid, and compressed natural gases.