Unit 12. human impact in ecosystems


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Unit 12. human impact in ecosystems

  1. 1. UNIT 10. Human impact in Ecosystems
  2. 2. VOCABULARY • • • • • • • • • • • • • • • Overexplotaition Land occupation Flood Draught Raising Trapping Crop Pest Hunger Need Loss Greenhouse efect Landfill Buried Burnt
  3. 3. In nature all things are recycled
  4. 4. Recycling…. Water cycle Energy cycle Biomass cycle
  5. 5. Humans change everything badly
  6. 6. How?
  7. 7. Overexploitation Land occupation Pollution What have we done? Human impact on the environment
  8. 8. Research: Human impact on the environment Discuss you understand these terms
  9. 9. Climate change
  10. 10. http://www.epa.gov/climatechange/kids/basics/index.html
  11. 11. Effects of Climate Change
  12. 12. Effects of Climate Change
  13. 13. Effects of Climate Change http://www.epa.gov/climatechange/kids/
  14. 14. Desertification, drought and flood
  15. 15. • Desertification is a complex process involving multiple natural and human-related causes. In desertification, the productive potential of arid and semi-arid lands falls by 10% or more, and topsoil is lost or degraded. – Desertification results mainly from a combination of natural climate changes causing prolonged drought and unsustainable human activities, including overgrazing and deforestation. Overgrazing on marginal lands (top) can extend desert zones (lower)
  16. 16. Loss of Biodiversity
  17. 17. Biodiversity is the degree of variation of life forms within a given species, ecosystem, biome, or an entire planet. Biodiversity is a measure of the health of ecosystems. Biodiversity is in part a function of climate.
  18. 18. http://www.novamind.com/connect/nm_documents/285
  19. 19. http://www.novamind.com/connect/nm_documents/285
  20. 20. If anything in your dustbin can be reused by somebody else, recycled or repaired it should not be there!
  21. 21. Waste is Costly The earth is a closed system. Matter amoung keeps constance. There are no losses. • Any nutrients and resources being taken out of the system (and buried in a landfill, or burnt) are resources lost to us. •
  22. 22. Examples…. To produce one ton of paper, 100 tons of water are used. For every litre of beer, 10 litres of water have been used in the fermenting process. Producing one cellphone requires 75 kg of resources. A toothbrush requires 1,5 kg of resources – coal, oil and water – for its production
  23. 23. Recycling…
  24. 24. Benefits of recycling • reduces the amount of waste going into landfill sites, saving airspace; • creates jobs and money for schools and organisations • reduces pollution and litter; • saves raw materials needed to make new products • reduces the need to import expensive raw materials
  25. 25. Benefits of recycling • slows down the use of the world’s non-renewable (oil, coal and iron) and renewable resources (trees) • reduces energy costs in manufacturing of containers, packaging, etc. • saves water (used in packaging and product manufacture). Recycling paper uses 50% less water than paper that is made from wood pulp.
  26. 26. 1) Why can we say Nature is continuously recycling? 2) Which are the main points to be considered in human impact on the environment? 3) Write five actions to make a contribution to solve global warming 4) Describe in your owm words, the human contribution to the desertification 5) Give three reason to practise the recycling that you can do in your diary life