+Human activity such as burning of fossil fuels = more co2/no2/so2 = green house gases
They absorb infrared light
+ These fuels from factories and vehicles (industrial, cars and domestic) combustion of fossil furls
+ Another place is farming – animals in digestion of crops (cows eg) emit methane gas to the atmosphere which is estimate 9% of gas in atmosphere
+ Evaporation of water to form water vapour – clouds are significant to green house effect t
+Refrigeration/ solvents/ propellants CFC’s – chlorine and carbon and fluorine ccl3f which Catalyses the breakdown of the ozone layer
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