4.13 Greenhouse gasses

understand how human activity contribute to greenhouse gases.
fossil fuels
-burning of fossil fuels results in the formation of more CO2, NO2, SO2 (carbon dioxide, nitrous dioxide being the greenhouse gasses)- absorb infrared light and redistribute back to earth.
- burning of fossil fuels from factories and vehicles, burning of coals, exhaust.

farming
-animals esp. cows emit methane into the atmosphere- around 9% of the atmospheric gases.

evaporation of water to form water vapour
-clouds are a significant contributor to the greenhouse effect.

refrigeration solvents and propellants
- CFCs- Chlorine Carbon and Fluorine- absorption of UV light and catalising the breakdown of the ozone layer.