<prompt> Which of the following is non-natural gas causing greenhouse effect -CO2H2OHydrofluorocarbonsOzone  <response>: Ans. is c Le., Hydrofluorocarbons Greenhouse effect o The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planets lower atmosphere and surface. Greenhouse gases include - Natural 1 CO2 3 Methane 5 Ozone 2 Nitrous oxide 4 Water vapor Non-natural gases include - 1 Hydrofluorocarbons 3 Perfluorocarbons 2 Sulfur hexafluoride 