B3- how humans affect the environment

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the effects of population increase

  • people demand a better standard of living
  • we use raw materials like fossil fuels that are non renewable
  • goods being produced makes lots of industrial waste
  • humans take up land used for farming and plants by building, quarrying and dumping waste
  • humans pollute water with sewage and fertilisrs
  • air with smoke like sulfur
  • land with toxic chemicals like perticides and herbicdes

land and water pollution

  • sewage contains human waste and waste from our homes that needs to be treated to remove parasites or toxic chemicals that can end up in water ways or soil
  • chemicals leak out in landfill due to rain and are washed into rivers, some waste is radioactive
  • herbicides and pesticides can get into the land and therefore the food chain which will end up in rivers

air pollution

  • power stations and cars release harmful air pollution
  • like sulfur dioxide which creates acid rain
  • the rain can kill treees and organisms
  • can change soil ph and damage roots
  • trees and plants begin a food chain so this would mean no food for other animals

deforestation and peat destruction

  • deforestation is the excessive cutting down of trees
  • deforestation occurs due to the need for timber and land for agricultural farming
  • deforestation has increased co2 in air, reduced rate at which co2 is removed and reduced biodiversity due to loss of habitats
  • land can be used for cattle and rice which produced methane
  • destruction of peat bogs result in the release of co2 in…


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