The great hope among energy wonks is that natural gas is the short-term salve for our climate woes. After all, burning natural gas for electricity emits just half the carbon dioxide that burning coal does. Plus, the United States seems to have an abundance of gas, particularly in the Marcellus Shale, and low natural-gas prices are already prodding many electric utilities to retire their coal plants. That’s why liberal groups like the Center for American Progress have dubbed natural gas a ‘bridge fuel,

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