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Dan ElliottDan ElliottAugust 15, 20166min335

A puzzling concentration of the greenhouse gas methane over the Southwestern United States appears to come mostly from leaks in natural gas production, scientists said Monday. Researchers identified more than 250 sources of a methane hot spot over the Four Corners region of Arizona, Colorado, New Mexico and Utah. They include gas wells, storage tanks, pipelines and processing plants.