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US environmentalists are targeting natural gas-fired power plants, which currently provide around a third of America’s power, as prevalence of coal wanes. Coal has already borne the brunt of environmental pressure, but natural gas is likely to be next, according to Robert Murray, chief executive officer of mining firm Murray Energy. Green organisations have previously advocated for the use of natural gas as a "bridge fuel", or transitional energy source in the process of decarbonisation. However, the gas industry produced more emissions in the US than coal for the first time last year, according to Bloomberg New Energy Finance.