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Methane, the primary component of natural gas, is one of the most potent heat-trapping pollutants, at least 25 times more powerful than carbon dioxide, the EPA says.
Governor sets goals for Pennsylvania to cut greenhouse gases →
The county's water supply was flushed, and the Virginia Department of Health and U.S. Environmental Protection Agency say it's safe.
Virginia town: Methane from sewer system contaminated water →
