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Global Warming, Acid Rain, and Ozone Depletion
- 2. Population and Resources Nearly 80 million person population increase each year, mostly in developing world = strained resources and systems
- 3. Developed World Nearly 85% of earth’s resources are consumed by 20% of the world’s population
- 4. Compliments of Mr. Marshall
- 5. Global Warming Global warming= increase in global temperatures abnormally high levels of carbon dioxide concentrated in the atmosphere
- 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 Observatory in Hawaii. Source: http://www.research.noaa.gov/spotlite/archive/images/jimomedal_graph.gif
- 7. Normal CO2 Levels Short Wave and Long Wave Radiation 1) 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
- 10. Compliments of Mr. Marshall
- 11. 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
- 12. Kyoto Protocol December 1997- 180 countries - agreement among industrialized nations to reduce emission of six greenhouse gases Canada- agreed to cut emissions 5.2% (1990 levels) by 2012 US- withdrew in 2001 (US was responsible for 25% worldwide emissions)= big setback for Kyoto Protocol
- 13. Ozone Depletion Ozone layer=naturally occurring protective shield in the stratosphere, 25 km+ into space Job= absorb harmful ultraviolet radiation from the sun protects humans, plants, and animals
- 14. Ozone Gaps and Holes Gaps and holes= harmful rays How? Scientists think it’s due to human activity
- 16. CFCs Chlorofluorocarbons= danger gas that chemically bonds to the ozone layer and eat away at the o.l.
- 17. Where do you find CFCs?
- 18. Consequences? • Skin cancer • Altered ocean ecosystems fishing tourism, logging • Harmful to flora and fauna of Canada’s north
- 19. Montreal Protocol 1987- Montreal Protocol- industrial nations agreed to cut use of CFCs
- 20. Acid Rain SO2and NOx carried long distances by strong winds deposited in acidic rain, snow, fog, dust
- 21. Compliments of Mr. Marshall Deposition Effects
- 23. Compliments of Mr. Marshall Cda vs USA? • 2/3 of CDA’s caused by INDUSTRY • 2/3 of USA’s from ELECTRICAL UTILITIES
- 24. Consequences • Eastern Canada, the Alps, the Appalachians, the US, and Japan • Animals and plants • Ecosystems • Corrodes steel • Lung capacity
- 25. 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%
- 26. Environmental Awareness 1962- Rachel Carson- Silent Spring 1987- UN Commission on the State of the Environment asked people of the developed world to reduce resource consumption & develop a sustainability lifestyle 1992- Earth Summit- Agenda 21 (encourage development of a sustainable world economy) 1992- World Scientists’ Warning to Humanity- earth stewardship
- 27. However… There has been little progress by governments and corporation Implementation=Losses