Global Warming, Acid Rain, and Ozone Depletion

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Global Warming, Acid Rain, and Ozone Depletion

  1. 1. Environmental Challenges
  2. 2. Population and ResourcesNearly 80 million person population increase each year, mostly in developing world= strained resources and systems
  3. 3. Developed WorldNearly 85% of earth’s resources are consumed by 20% of the world’s population
  4. 4. Compliments of Mr. Marshall
  5. 5. Global WarmingGlobal warming= increase in global temperatures abnormally high levels of carbon dioxide concentrated in the atmosphere
  6. 6. Compliments of Mr. Marshall The recent temperature trend is accompanied by a similar, highly-correlated upward trend in atmospheric concentrations of carbon dioxide. Is it due to human activity?The "Keeling Curve" of CO2 concentrations as measured at the Mauna Loa Observatoryin Hawaii.Source: http://www.research.noaa.gov/spotlite/archive/images/jimomedal_graph.gif
  7. 7. Normal CO2 Levels Short Wave and Long Wave Radiation1) Sun emits rays called short-wave radiation (light rays)2) Short wave radiation is either absorbed into the earth’s surface or reflected back into space
  8. 8. High CO2 Levels
  9. 9. Compliments of Mr. Marshall
  10. 10. Consequences• Canada’s Arctic regions’ sea ice is shrinking• Warmer weather= forest fires & Prairie droughts• British Columbia- salmon survival decreased by 1/3 since early 1990s• Polar bear depletion
  11. 11. Kyoto ProtocolDecember 1997- 180 countries - agreement among industrialized nations to reduce emission of six greenhouse gasesCanada- agreed to cut emissions 5.2% (1990 levels) by 2012US- withdrew in 2001 (US was responsible for 25% worldwide emissions)= big setback for Kyoto Protocol
  12. 12. Ozone DepletionOzone layer=naturally occurring protective shield in the stratosphere, 25 km+ into spaceJob= absorb harmful ultraviolet radiation from the sunprotects humans, plants, and animals
  13. 13. Ozone Gaps and HolesGaps and holes= harmful raysHow? Scientists think it’s due to human activity
  14. 14. CFCsChlorofluorocarbons= danger gas that chemically bonds to the ozone layer and eat away at the o.l.
  15. 15. Where do you find CFCs?
  16. 16. Consequences?• Skin cancer• Altered ocean ecosystems fishing tourism, logging• Harmful to flora and fauna of Canada’s north
  17. 17. Montreal Protocol1987- Montreal Protocol- industrial nations agreed to cut use of CFCs
  18. 18. Acid RainSO2and NOx carried long distances by strong winds deposited in acidic rain, snow, fog, dust
  19. 19. Compliments of Mr. MarshallDeposition Effects
  20. 20. Compliments of Mr. Marshall Cda vs USA?• 2/3 of CDA’s caused by INDUSTRY• 2/3 of USA’s from ELECTRICAL UTILITIES
  21. 21. Consequences• Eastern Canada, the Alps, the Appalachians, the US, and Japan• Animals and plants• Ecosystems• Corrodes steel• Lung capacity
  22. 22. Acid Rain Regime• Lower emissions fossil fuels• 1990- Clean Air Act- tradeable permits• 1991- Air Quality Accord-US and Canada• 1993-emissions reduced by 30%
  23. 23. Environmental Awareness1962- Rachel Carson- Silent Spring1987- UN Commission on the State of the Environment asked people of the developed world to reduce resource consumption & develop a sustainability lifestyle1992- Earth Summit- Agenda 21 (encourage development of a sustainable world economy)1992- World Scientists’ Warning to Humanity- earth stewardship
  24. 24. However…There has been little progress by governments and corporationImplementation=Losses

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