Natural gas has about 5% impurities other than methane. There's no need to change standard terminology when discussing energy. Countries who use coal have even

Natural gas has about 5% impurities other than methane. There's no need to change standard terminology when discussing energy. Countries who use coal have even more emissions. 20% of US power generation comes from coal even now. More natural gas now, displacing coal, means less total emissions, even ignoring the particulate and mercury pollution from coal. So right now, natural gas reduces CO2 emissions!