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Sci 10 Lesson 2 May 6 - Human Activity and Climate Change
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Sci 10 Lesson 2 May 6 - Human Activity and Climate Change


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  • 1. Homework from last class:
    • Complete Check Your Understanding questions on p. 481
    • #s 1-8, 10, 12-15
    • Bring May 12 th Playland field trip forms and money ASAP!
      • Due date to bring in forms and money is Monday, May 9th
    • Read over class notes and check out the class blog:
  • 2. Human Activity and Climate Change Chapter 11.2 pp. 482-496
  • 3. What is climate change?
    • Climate change: changes in long-term weather patterns in certain regions.
      • These changes affect the redistribution of thermal energy around Earth.
      • Global warming: an increase in Earth’s average global temperature
        • Both the causes and effects of global warming are unknown and controversial.
    pp. 482 - 483
  • 4. The Enhanced Greenhouse Effect
    • enhanced greenhouse effect: the increased capacity of the atmosphere to trap thermal energy due to an increase in greenhouse gases
      • Greenhouse gases include water vapour, CO 2 , methane, nitrous oxide, and CFCs.
        • CFCs = chlorofluorocarbons (ex: liquid coolants, air conditioning)
      • Global warming potential (GWP): the ability to trap thermal energy
          • CO 2 is given a GWP of 1; CFCs are 4750-5310 .
    p. 484 Main cause of ozone depletion.
  • 5.
    • Ozone is an important UV radiation blocker in the stratosphere.
      • At lower altitudes, however, it is a very powerful greenhouse gas .
        • Results from solar radiation reacting with pollution from the burning of fossil fuels
        • Released from photocopiers and certain air conditioners
  • 6. Albedo and Climate, Making Predictions About Climate Change
    • The albedo at Earth’s surface affects the amount of solar radiation that region receives.
    p. 487
      • Forests have a low albedo. Deforestation increases albedo.
        • Forests also emit large amounts of water vapour, which reflects solar radiation back into space.
        • Deforestation’s effects on climate change are unknown.
      • Changes in a region’s albedo (ex: snow cover melting earlier in the season than it did previously) could result in climate change .
  • 7. The Role of Science in Understanding Climate Change
    • Scientists use computers to model what Earth’s climate might be like.
      • Although models differ, most indicate that a decrease in the production of greenhouse gases is necessary to stop the apparent global warming trend .
      • General circulation models (GCMs): computer models used to study climate
        • Take into account changes in greenhouse
        • gases, albedo, ocean currents, winds and
        • surface temperatures.
        • Used for weather forecasting, climate
        • analysis, and climate change predictions.
    p. 488 Projected global temperatures.
  • 8. The Role of International Cooperation in Climate Change
    • Human-induced climate change is a recent occurrence.
      • The United Nations and the World Meteorological Organization created the Intergovernmental Panel on Climate Change (IPCC) to address global concerns about climate change and global warming.
        • The IPCC, formed in 1988, has members from 130 countries.
        • The IPCC examines possible climate change, highlights the causes, and suggests solutions.
      • The United Nations Framework Convention on Climate Change created a voluntary treaty to encourage governments to reduce greenhouse gas emissions.
    p. 489
  • 9. Global Impacts of Climate Change p. 489 - 490
  • 10. Impacts of Climate Change on Canada
    • Canada could be strongly affected by global warming.
      • Areas of Canada - average temperature increases of 0.5ºC to 1.5ºC.
        • The Arctic regions are losing permafrost (ground that remains frozen year-round) and Arctic Ocean ice cover.
        • Longer growing seasons and more precipitation is falling.
          • Could be heavier spring rains and severe droughts in the future.
          • Fisheries could be very negatively affected.
          • Pollution could lead to health issues.
        • Most regions of British Columbia will probably be warmer, sea levels will rise, and fresh drinking water may be harder to find as glaciers disappear.
    p. 490 - 492
  • 11. Action Plan Addressing Climate Change
    • Although climate change is a controversial issue, our actions now are important.
    • Relatively small changes could have large positive impact on the climate in Canada.
      • Reduce vehicle greenhouse gas emissions.
      • Reduce industrial greenhouse gas emissions.
      • Increase use of energy-efficient products.
      • Improve indoor air quality .
    p. 493 - 496
  • 12. Homework for next class:
    • Complete Reading Check questions on p. 501 #s 1-10
    • Study Chapter 10 and 11 Review sheet - review next class
      • Chapter 10 and 11 test – Monday, May 16th
    • Bring May 12 th Playland field trip forms and money ASAP!
      • Due date to bring in forms and money is Monday, May 9th
    • Read over class notes and check out the class blog:
    • Have a great weekend!
  • 13. Works Cited
    • Images taken from the following sources:
    • Power Point Credit:
    • McGraw Hill Ryerson, 2007.