Natural gas emissions study draws fire

Nature: In the calculus of global warming, natural gas is generally considered to be preferable to coal as a fuel. That's because, on a per-joule basis, burning methane, the primary constituent of natural gas, produces less carbon dioxide than burning coal. But, earlier this week, the conventional wisdom was shaken by researchers from Cornell University in Ithaca, New York, who argue in a study to be published in Climate Change1 that, over a 20-year period, the use of natural gas extracted from 'gas shales',......

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