New York Times: A policy analysis published in Science today examines 20 years of research on leakage from natural gas production and distribution systems in North America, including hydraulic fracturing, or fracking, and finds big opportunities to cut the worst leaks and a substantial climate benefit from a coal-to-gas switch, even accounting for higher leak rates. Gas leaks are not only wasteful and a source of regional air pollution but also contribute to global warming because the main constituent of nature...