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Global Warming is the increase of Earth's average surface temperature due to effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
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Increase in the amount of carbon dioxide in atmosphere causes rise in temperature this is global warming .The other reason for it is increasing amount of CFC (chloro fluor carbon ) released by A.Cs which cause in depleting of Ozone layer.  
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