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 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,Greenhouse gases keep the Earth warm through a process called the greenhouse effect Play the video to learn more » The Earth gets energy from the sun in the form of sunlight The Earth's If the greenhouse effect didn't exist, the average temperature of the earth would decrease from 14C (57F) to the lowest being 18C (04F) There are layers of greenhouse Greenhouse Effect Wallpapers Wallpaper Cave Greenhouse effect photos hd download