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Presentation On Edf 2005
 

Presentation On Edf 2005

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    Presentation On Edf 2005 Presentation On Edf 2005 Presentation Transcript

    • Wang and Oppenheimer; Environmental Defense Fund, 2005 The Latest Myths and Facts on Global Warming An example of a group-led discussion on a paper
    • Summary
      • Common myths are presented and “busted” using references to current data.
      • Most of these topics are also discussed in the IPCC report.
      • The overwhelming conclusion is that Global Warming is happening and is caused by humans.
    • Factors that control Earth’s Climate
      • External Controls (What energy comes IN)
        • Sun’s Radiation
        • Rotation of the earth
        • Tilt and wobble of the earth’s axis
      • Internal Controls (What energy goes OUT)
        • Heat released from the earth
        • Earth’s reflectivity ( albedo )
        • Air and ocean circulation
        • Composition of the atmosphere
          • (clouds, water vapor, air pollution)
      Affected by Human Activity
    • Discussion Questions
      • Who are the authors? What is their motivation? What is the EDF?
      • Do you believe all their statements? Where is the evidence?
      • Do you care more about regional or global changes? How would this affect politics and ecology?
      • Why does it matter if the warming is caused by humans or not? Why does it matter if there have been previous warm periods or not?
      • Why would urbanization be important? What is the relative contribution of cities versus the surface area of the earth?
    • Figure 1a.
    • Hockey Stick Debate
      • Mann, M. E.; Bradley, R. S. & Hughes, M. K. (1998) Global-scale temperature patterns and climate forcing over the past six centuries , Nature 392 : 779-787 .
      • Soon, W.-H., S.L. Baliunas, C. Idso, S. Idso, and D.R. Legates (2003) Reconstructing Climatic and Environmental Changes of the Past 1000 Years: A Reappraisal. Energy and Environment 14 : 233-296.
    • Figure 1b.
    • Discussion Qstns Cont’d
      • What is the difference between Climate Change and Global Warming?
      • What is the difference between Weather and Climate?
      • Who are the people spreading these myths? Why are people so skeptical about Climate Change? And Science in general?
      • Is one hot summer enough evidence? Example: coral bleaching in 1997-1998, was also a Strong El Nino year…
      • Think of economics: as countries develop (and make more money) do they increase or decrease emissions?
    • Figure 2.
    • Meehl et al, 2004: J. Climate.
      • What causes changes in climate besides carbon dioxide?
      • What is a feedback? What are examples of positive and negative feedbacks in climate?
      • How is the ocean involved in climate?
      • Making decisions based on uncertain or incomplete data is difficult for most people. Think of examples of other actions we take based on uncertain data…
    • Questions from YOU?
      • What did you find most surprising?
      • What did you not understand?
      • Which myths had you heard before?
      • Which do you still believe?
      • Do you trust these authors?
      • Adaptation or prevention?
    • Relevance for Final Projects
      • How could Global Warming/Climate Change affect the water bodies around NYC?
      • What characteristics are worth looking at for evidence of Climate Change?
      • What timescale should you look at for evidence?