In the report, the Environment Illinois and the U.S. Public Interest Research Group say carbon dioxide emissions increased 22 percent in Illinois and 18 percent across the country between 2000 and 2004.
Environment Illinois recommends that power generators stop burning coal. The group suggests relying on wind power and solar energy. The report calls for stronger federal limits on emissions and increases in energy efficiency.
Most climate scientists say carbon dioxide is the primary heat-trapping "greenhouse" gas that could lead to an increase in global temperatures.