Unit 3 pp #5


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Unit 3 pp #5

  1. 1. Global Climate Change <ul><li>Created as part of
National Science Foundation ITEST Grant #0833706. </li></ul><ul><li>Any opinions, findings, and conclusions or recommendations expressed in this material do not necessarily reflect the views of the National Science Foundation.  </li></ul>
  2. 2. GLOBAL CLIMATE CHANGE What is it?
  3. 3. Global Climate Change <ul><li>Identifiable change in the climate of Earth as a whole that lasts for an extended period of time (decades or longer) </li></ul><ul><ul><li>When due to natural processes, it is usually referred to as global climate variability </li></ul></ul><ul><ul><li>Usually refers to changes forced by human activities that change the atmosphere </li></ul></ul>
  4. 4. What causes Earth’s climate to change? <ul><li>Changes in the atmosphere </li></ul><ul><li>Natural processes </li></ul><ul><ul><li>Volcanoes </li></ul></ul><ul><ul><li>Tectonic plate movement </li></ul></ul><ul><ul><li>Changes in the sun </li></ul></ul><ul><li>Human activities – any activity that releases “greenhouse gases” into the atmosphere </li></ul>
  5. 5. What are greenhouse gases? Any gases that cause the “greenhouse effect!” carbon dioxide nitrous oxide methane Imagine… a car on a cool but sunny day… water vapor
  6. 8. GLOBAL CLIMATE CHANGE Who's researching it?
  7. 9. Research <ul><li>Almost 1000 studies dealing with different aspects of climate change have been conducted and published </li></ul><ul><li>So… how do we make sense of all this? </li></ul>
  8. 10. Intergovernmental Panel on Climate Change (IPCC) <ul><li>Why was it created? </li></ul><ul><ul><li>Created in 1988 by the United Nations Environmental Program </li></ul></ul><ul><ul><li>Established to provide policy-makers with an objective source of information about climate change </li></ul></ul>
  9. 11. Intergovernmental Panel on Climate Change (IPCC) <ul><li>Who is it? </li></ul><ul><ul><li>Governments </li></ul></ul><ul><ul><ul><li>Members of the UN </li></ul></ul></ul><ul><ul><ul><li>Participate by naming experts and reviewing the reports before they’re published </li></ul></ul></ul><ul><ul><li>Scientists </li></ul></ul><ul><ul><ul><li>Close to 1000 scientists </li></ul></ul></ul><ul><ul><ul><li>Climatologists, ecologists, atmospheric physicists, and others </li></ul></ul></ul>Dr. Susan Solomon, a NOAA atmospheric chemist, an IPCC member and one author of IPCC summary
  10. 12. Intergovernmental Panel on Climate Change (IPCC) <ul><li>What do they do? </li></ul><ul><ul><li>Review current scientific and technical literature relevant to global climate change </li></ul></ul><ul><ul><li>Provide reports on their findings at regular intervals </li></ul></ul><ul><ul><li>Reports are designed to be politically neutral and of high scientific and technical standards </li></ul></ul>
  11. 13. GLOBAL CLIMATE CHANGE Well, what does the data say?
  12. 14. Observed Changes and Effects
  13. 15. Warming of Climate <ul><li>Warming of the climate is definitely occurring and can be observed by the: </li></ul><ul><ul><li>Increases in global sea and air temperatures </li></ul></ul><ul><ul><li>Widespread melting of snow and ice </li></ul></ul><ul><ul><li>Rising global sea level </li></ul></ul>
  14. 17. Temperature Change Data 1880-1884
  15. 18. 1880-1884 1886-1890
  16. 19. 1896-1900
  17. 20. 1906-1910
  18. 21. 1916-1920
  19. 22. 1926-1930
  20. 23. 1936-1940
  21. 24. 1946-1950
  22. 25. 1956-1960
  23. 26. 1966-1970
  24. 27. 1976-1980
  25. 28. 1986-1990
  26. 29. 1996-2000
  27. 30. 2003-2007
  28. 31. Other Observed Changes and Effects <ul><li>89% of current changes in ecosystems are consistent with changes expected due to global climate change </li></ul><ul><li>Carbon dioxide, methane, and nitrous oxide levels in atmosphere have increased greatly due to human activities since 1750 and now far exceed previous levels </li></ul><ul><li>Carbon dioxide has increased by approximately 80% since 1970 </li></ul>
  29. 32. Human-Produced Greenhouse Gas Levels
  30. 33. Causes of Change
  31. 34. Most of the observed increase in global average temperature since the mid-20 th century is very likely due to the observed increase in human-caused greenhouse gas concentrations and human influences have very likely contributed to sea level rise, too.
  32. 35. References <ul><li>IPCC Summary Report for Policy Makers . November 2007 </li></ul><ul><li>&quot;About IPCC.&quot; IPCC - Intergovernmental Panel on Climate Change . 20 Apr. 2009 <http://www.ipcc.ch/about/index.htm>. </li></ul><ul><li>&quot;Climate Change | U.S. EPA.&quot; U.S. Environmental Protection Agency . 20 Apr. 2009 <http://epa.gov/climatechange/index.html>. </li></ul><ul><li>Rischard, J. F. High noon twenty global problems, twenty years to solve them . New York: Basic Books, 2002. </li></ul><ul><li>&quot;SVS Animations.&quot; NASA Goddard Scientific Visualization Studio . 20 Apr. 2009 <http://svs.gsfc.nasa.gov/vis/a000000/a003400/a003490/index.html>. </li></ul>