Ans: Greenhouse Effects
The term 'Greenhouse.Effect refers to the phenomenon in which certain gases (called greenhouse gases) trap heat in the atmosphere. These gases act like the -glass in a greenhouse, which does, not allow the inner heat to escape. When sunlight reaches the surface of the Earth, much of its energy is transformed into heat energy. The Earth surface reflects this heat energy towards space as infrared radiation. The greenhouse gases trap infrared radiation and send it back to the Earth. Carbon dioxide, methane and nitrous oxide are important greenhouse gases. Since 1800, the amount of Carbon dioxide in atmosphere has increased about 30 %. The amount of methane has more than doubted and the amount of nitrous oxide has increased about 8%.