The report shows that both methane and nitrous oxide emissions have decreased from 1990 levels by 10 percent and two percent, respectively. Overall, greenhouse gas emissions during 2004 increased by 1.7 percent from the previous year. This increase, which occurred during a period of economic expansion, was due primarily to an increase in carbon dioxide emissions associated with fuel and electricity consumption. Fossil fuel combustion was the largest source of emissions, accounting for 80 percent of the total. While the U.S. economy expanded by 51 percent from 1990 to 2004, emissions have grown by only 15.8 percent over the same period.Click here for the report.
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