3 Questions: Francis O'Sullivan on the climate impact of 'leaky methane'

Natural gas has been touted as a "bridge fuel" to a less carbon-intensive future, as it generates far less carbon dioxide than energy produced by burning coal. But the natural gas production, processing, and distribution system leaks methane, another powerful greenhouse gas. A study published today in the journal Science reports that federal estimates of methane emissions have consistently underestimated the methane leaking from the natural gas system over the last 20 years. The study's new estimates raise questions about natural gas's actual climate benefit.

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