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Answer
Greenhouse effect means the progressive warming up of the Earth's surface due to the blanketing effect of man-made carbon dioxide in the atmosphere. It is a natural process in which certain gases like carbon dioxide and water vapour (called greenhouse gases) trap heat that radiates from the earth's surface. These gases act like the glass panels of a greenhouse, allowing short-wave solar radiation to enter but preventing long-wave infrared radiation from escaping, thus keeping the earth warm and habitable. The term 'greenhouse effect' was coined by J. Furrier in 1827.