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-- Jump to main content US EPA United States Environmental Protection Agency Search Search Greenhouse Gas Emissions Share Facebook Twitter Google+ Pinterest Contact Us Overview of Greenhouse Gases Overview Carbon Dioxide Methane Nitrous Oxide Fluorinated Gases Total Emissions in 2014 = 6,870 Million Metric

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A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect . The primary greenhouse gases in Earths atmosphere are water vapor , carbon dioxide , methane , nitrous oxide , and o