Trapping of sun’s heat in the
lower atmosphere due to increase in the pollution causing gases like carbon
dioxide is called greenhouse effect.
Greenhouse gases are water
vapour, carbon dioxide, methane and ozone, nitrous oxide etc.
Sun’s radiation is partly
absorbed by earth and rest of the radiations are reflected back to the
atmosphere which are escaped. But the greenhouse gases form blanket in the
atmosphere and traps the radiation from escaping. This causes an increase in
earth’s temperature resulting in Global warming.