... West Virginia, Wisconsin, Wy-o-o-ming!

Burning coal accounts for half of America's electricity. And coal produces more carbon dioxide than any other commonly used U.S. fuel source. The states that rely the most on coal — Wyoming, North Dakota, West Virginia, Indiana — generally produce the most carbon dioxide pollution per person, but also have the cheapest electric rates.

States that shun coal — Vermont, Idaho, California, Rhode Island — and turn to nuclear, hydroelectric and natural gas, produce the least carbon dioxide but often at higher costs for consumers.

It's unfair to pin all the blame on the coal-using states, said Washington lawyer Jeffrey Holmstead, who as an attorney at Bracewell Giuliani represents coal-intensive utilities and refineries. Holmstead is the former Bush administration air pollution regulator who ruled that carbon dioxide was not a pollutant, a decision that was overturned recently by the U.S. Supreme Court.

"Coal-fired generation is the most economical, least expensive way to produce power almost anywhere in the world," he said. He argued that outlawing such plants would have little overall impact globally; however, the U.S. has long been the leading global source of carbon emissions.

Instead of trying to wean themselves from coal, Texas government officials went out of their way to encourage the state's biggest utility, TXU Corp., to plan for 11 new coal-burning power plants that would have produced even more carbon dioxide. The strategy collapsed when an investor group buying TXU cut a deal with environmentalists to drop plans to build most of the coal plants.