4.13 Greenhouse gases

Key points:
1. Human activity includes the burning of fossil fuels, and the emmisions such as carbon dioxide and nitrous oxide are created
2. They absorb infra-red light and redistribute it back to earth. The burning of fossil fuels from out factories and from vehicles, and perhaps from the burning of coals. Industrial, cars and domestic combustion.
3. Farming. Animals, such as cows emit methane gas for the process of digestion which is considered to be significant, around 9%, to greenhouse gases. Evaporation of water to form water vapour. Clouds are a significant contributer ot the greenhouse effect.
4. Refrigeration, solvents and propellents and CFCs. Chlorine carbon and flourine such as CCL3F.