Yale Environment 360: Pipeline replacement programs in cities can cut natural gas leaks by 90 percent, curbing the release of the powerful greenhouse gas methane and boosting public safety, according to a study published in Environmental Science & Technology Letters. Researchers drove cars equipped with sensitive methane-mapping instruments through thousands of miles of city streets in Manhattan, Boston, Cincinnati, Durham, and Washington, D.C. They discovered that Durham and Cincinnati, where public-private partnerships...