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Greenhouse gases in the atmosphere absorb heat energy and prevent it escaping into space This keeps the Earth warmer than it would be without these gases Greenhouse gases are not a The Main Greenhouse Gases 1,2 Atmospheric Greenhouse Gas Emissions Since 1750, atmospheric concentrations of CO 2 , CH 4 , and N 2 O, increased by 147%, 259%, and 123%, respectively, to levels that are unprecedented in the past 800,000 years 1,2 The other major anthropogenic greenhouse gases (methane, nitrous oxide (N 2 O) and some fluorinated gases (sulfur hexafluoride (SF 6), hydrofluorocarbons (HFCs), and perfluorocarbons (PFCs)) 147), are not included in the following list, nor are humans emissions of water vapor (H 2 O), the most important greenhouse gases, as they are negligible Types Of Greenhouse Gases Definition And Effects On Climate Change What are the 4 most common greenhouse gases