Gasoline and diesel vehicles are the leading source of carbon dioxide (CO2) emissions in the USA. In addition to CO2, combustion engines release pollutants that cause smog and are harmful to human health.
Ask the Expert
Have questions about how best to save energy in your home? Well, Ask the Expert! Here you can find the energy efficiency advice you need on ENERGY STAR certified products and home improvement projects by viewing articles, videos and more created by the experts at EPA’s ENERGY STAR program.