4.13) understand how human activities contribute to greenhouse gases
Burning of fossil fuels (from factories and vehicles/ industrial process/ domestic combustion) ---> SO2+ CO2/ NO2 = green house gases --- absorbs infrared rays and reemit them back to earth
Farming
- animal such as cows can emit methane gas to the atmosphere, which provide 9%
Evaporation of water ---> water vapour
Clouds are water vapour
Refrigeration/ Solvents/ Propellant --- CFC --- chlorine, carbon, fluoine--- CCl3F
absorbs ultraviolet light and catalyst the breakdown of ozone layer
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