As of June 2006, [US] power producers have approximately 150 new coal-fired plants on the drawing board...[that] would increase U.S. carbon dioxide pollution from electricity generation by more than 25 percent above 2004 levels...a 10 percent increase in total U.S. emissions and a 2.4 percent increase in world emissions. The vast majority of proposed plants use traditional coal-burning technology, which emits massive amounts of carbon dioxide... Even [certain more efficient] plants would require costly future upgrades to avoid large releases of global warming pollutants... Companies that build coal-fired power plants today knowingly and significantly contribute to the public health, environmental and property damage that will result from global warming. [refers to Tucson Electric Power (part of Unisource), LS Power Development, Xcel Energy, MidAmerican Energy (part of Berkshire Hathaway), Omaha Public Power District, Santee Cooper, NRG Energy, General Electric; lawsuit against American Electric Power, Southern Company, Tennessee Valley Authority, Xcel Energy, Cinergy (now Duke Energy) over emissions; energy-efficient plants & technologies developed by Solargenix Energy, San Diego Gas and Electric (part of Sempra), Southern California Edison (part of Edison International)]