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

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