Greenhouse gas emissions by the United States

Until 2006, the United States was the largest emitter of carbon dioxide emissions
The U.S. State Department is offering a nation-level perspective by releasing the Fourth US Climate Action Report (USCAR) to the United Nations Framework Convention on Climate Change, that includes measures to address climate change. The report shows that the country is on track to achieve President Bush's goal of reducing greenhouse gas intensity (the amount of GHG emissions per unit of gross domestic product) by 18 percent from 2002 to 2012. Over that same period, actual GHG emissions are projected to increase by 11 percent. The report estimates that in 2006, U.S. GHG emissions decreased 1.5 percent from 2005 to 7,075.6 teragrams of carbon dioxide equivalent. This represents an increase of 15.1 percent from the 1990 levels of 6146.7 teragrams (or 0.9 percent annual increase), and an increase of 1.4 percent from the 2000 levels of 6978.4 teragrams. By 2012, GHG emissions are projected to increase to more than 7,709 teragrams of carbon dioxide equivalent, which will be 26 percent above 1990 levels.
The White House announced on 2009-11-25 that President Obama is offering a U.S. target for reducing greenhouse gas (GHG) emissions in the range of 17% below 2005 levels by 2020.

Carbon Dioxide Emissions by state