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Global warming refers to the anthropogenic warming of the planet This warming comes from intensifying the greenhouse effect , an effect that exists on many other planets and has existed on Earth for almost as long as the planet has 2The role of greenhouse gases in maintaining global temperature The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is reradiated in all directions Since part of this reradiation is back towards the surface and the lower atmosphere, it results in an elevationGlobal warming global warming Radiative forcing In light of the discussion above of the greenhouse effect, it is apparent that the temperature of Earth's surface and lower atmosphere may be modified in three ways (1) through a net increase in the solar radiation entering at the top of Earth's atmosphere, (2) through a change in the fraction of the radiation reaching the surface, Via Giphy Giphy Global Warming Gif