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23/6/ The most abundant greenhouse gas in Earth's atmosphere is water vapour and it is this gas that provides the natural greenhouse effect Without this The natural greenhouse effect The natural greenhouse effect is a phenomenon caused by gases naturally present in the atmosphere that affect the behaviour of the heat energy radiated by the sun In simple terms, sunlight (shortwave radiation) passes through the atmosphere, and is absorbed by Earth's surfaceThe greenhouse effect happens when certain gases—known as greenhouse gases—collect in Earth's atmosphere These gases, which occur naturally in the atmosphere, include carbon dioxide, methane, nitrogen oxide, and fluorinated gases sometimes known as chlorofluorocarbons (CFCs) Greenhouse gases let the sun's light shine onto the Earth's surface, but they trap the heat that Overview Of Greenhouse Gases Us Epa Natural greenhouse effect model