This figure shows emissions of carbon dioxide (CO2) by fuel source across all sectors of the economy. The fuels shown are coal, natural gas, petroleum, as well as the total emissions.
Overall, coal and petroleum consumption are down since 2007, while natural gas use has increased. In the electric power sector, natural gas, which emits about half the amount of CO2 as coal, is being used more extensively due to its lower price. In the transportation sector, petroleum consumption is down due to an increase in car and light truck fuel economy (for a similar number of vehicle miles traveled, year-on-year). Correspondingly, total emissions have declined since 2007.
Source: EIA (2012)