U.S. Greenhouse Gas Emissions
In 2009, total U.S. greenhouse gas emissions were 6,633.2 Tg or million metric tons CO2 Eq. While total U.S. emissions have increased by 7.3 percent from 1990 to 2009, emissions decreased from 2008 to 2009 by 6.1 percent (427.9 Tg CO2 Eq.). This decrease was primarily due to (1) a decrease in economic output resulting in a decrease in energy consumption across all sectors; and (2) a decrease in the carbon intensity of fuels used to generate electricity due to fuel switching as the price of coal increased, and the price of natural gas decreased significantly. Since 1990, U.S. emissions have increased at an average annual rate of 0.4 percent.
U.S. Greenhouse Gas Emissions by Gas
Annual Percent Change in U.S. Greenhouse Gas Emissions
Cumulative Change in Annual U.S. Greenhouse Gas Emissions Relative to 1990
2009 CO2 Emissions from Fossil Fuel Combustion by Sector and Fuel Type
Source: EPA 2011 U.S. Greenhouse Gas Inventory Report