What are current levels of GHG emissions in the U.S.?

In 1990, total greenhouse gas emissions in the United States were 1,641 million metric tons carbon equivalent (MMTC), of which carbon emissions from the combustion of energy resources such as coal and petroleum comprised about 82 percent. By 1998, total greenhouse gas emissions had risen almost 10%. The pie graphs show the amounts of CO₂, CH₄, N₂0, etc. generated in the United States and the total carbon equivalent generated by each economic sector. Future levels of these three greenhouse gases are expected to increase another 33% by 2010. Because the majority of greenhouse gas production comes from the use of energy, it is a natural place to focus attention with respect to reducing greenhouse gas reductions.

WEB SITES (for more information)
www.epa.gov/globalwarming/emissions/national/CO2.html
www.epa.gov/globalwarming/emissions/national/methane.html
www.epa.gov/globalwarming/emissions/national/n2o.html