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Total GHG emissions of the six main greenhouse gases (weighted to
reflect equivalent emissions of carbon dioxide or CO2), rose from
6,689 to 6,748 million metric tons. These gases include: CO2,
methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and
sulfur hexafluoride. The CO2 from fossil fuel combustion at power
plants and factories is the largest source of all greenhouse
gases, accounting for 80 percent of all emissions in 1999. Fossil
fuel combustion was responsible for 88 percent of total
greenhouse emission growth from 1990 to 1999. The study also
shows that from 1990 - 1999, GHG emissions from cars, trucks and
buses rose 21 percent, while total highway miles traveled climbed
13 percent.

The report is available at A
Federal Register notice announcing a 40-day public comment period
on the report was published Jan. 9. To receive a hard copy of
this document, fax a request to the Agency at 202-260-6405, or
write to the following address: U.S. EPA, Office of Atmospheric
Programs, Market Policy Branch (MC: 2175), 1200 Pennsylvania
Avenue NW., Washington, DC 20460. For technical information, call
Wiley Barbour of EPA's Office of Air and Radiation at

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