speak 3 minute for Global warming

Answer Posted / anushkrishnan

Global Warming occurs as a result of increased concentration of greenhouse gases in the
atmosphere. The main greenhouse gases are water vapor, carbon dioxide, methane,
nitrous oxide and ozone. These gases do now allow all the radiations from the Earth to
escape back info space. This is known as theGreenhouse Effect. This trapped radiation
or heat helps to keep the Earth at a constant temperature. Greenhouse effect is thus very
important to main the temperature of the Earth at a habitable level.

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