Humans and their effects on the environment 

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  • Humans and their effects on the environment
    • Population growth
      • Human Population
        • the developm-ent of agriculture led to increases in population around the world.
        • humans exploit their surroundings for resource
      • Standards of living
        • definition- how much wealth a group of people have and the goods and services available to them. Life expectancy and literacy rate may also be taken into account. 
        • people in the developed world enjoy a high standard of living
        • people in the developin-g world have a lower standard of living but are catching up quickly
      • Impact of humans
        • the growth in human population and improve-ments of standard living are putting strains on the global environm-ent
        • we are using up non-renewable resources quickly e.g. coal, oil, and natural gases
        • raw materials are being used up rapidly
        • moe land is being used up by building, quarrying, farming and dumping waste ,so there is then less land available for animals
          • Land and water pollution
            • Pollution
              • pollution is  the addition of substanc-es to the environm-ent that may be harmful to the living organisms around
              • population growth and a higher standard of living can cause more waste to be produced
            • Land pollution
              • to improve yield produced, farmers tend to use herbicides and pesticides
                • herbicides
                  • this reduces the competiti-on for resources lie such as minerals, space and  light
                • pesticides
                  • pesticides increase yield by killing off pests e.g. insects or plant pathogens,which would usually feed on crops
              • some chemicals can remain in the soil for long periods of time polluting the land
                • this has consequences further up the food chains
              • most waste is buried at landfill sites and one of it is very unsafe
            • Water pollution
              • caused by discharge of harmful substanc-es into rivers a lakes
              • minerals in fertilisers can run into rivers and cause a process called eutrophic-ation
                • this is the overgrow-th of algae which leads to oxygen depletion
                  • depletion- using up of a useful chemical to th point at which it is too low
                  • this leads to the death of invertebrate and fish so the food chain and eco -system collapses
              • Sewage
                • sewage also pollutes waterways
                • sewage contains high levels of minerals and can promote the process of eutrophicati-on
                • it also contains harmful pathogens
        • more waste is being produced
    • Land and water pollution
      • Pollution
        • pollution is  the addition of substanc-es to the environm-ent that may be harmful to the living organisms around
        • population growth and a higher standard of living can cause more waste to be produced
      • Land pollution
        • to improve yield produced, farmers tend to use herbicides and pesticides
          • herbicides
            • this reduces the competiti-on for resources lie such as minerals, space and  light
          • pesticides
            • pesticides increase yield by killing off pests e.g. insects or plant pathogens,which would usually feed on crops
        • some chemicals can remain in the soil for long periods of time polluting the land
          • this has consequences further up the food chains
        • most waste is buried at landfill sites and one of it is very unsafe
      • Water pollution
        • caused by discharge of harmful substanc-es into rivers a lakes
        • minerals in fertilisers can run into rivers and cause a process called eutrophic-ation
          • this is the overgrow-th of algae which leads to oxygen depletion
            • depletion- using up of a useful chemical to th point at which it is too low
            • this leads to the death of invertebrate and fish so the food chain and eco -system collapses
        • Sewage
          • sewage also pollutes waterways
          • sewage contains high levels of minerals and can promote the process of eutrophicati-on
          • it also contains harmful pathogens

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