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Preponderance of Evidence

This resource provides evidence of climate change through temperature data, glacier shrinkage, increasing wildfire risk, rising CO2 concentration, ice core records, projected temperature changes, species shifting, and diminishing snowpack.

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Preponderance of Evidence

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  1. Preponderance of Evidence Lesson Plan 6 – Day 1

  2. Temperature (1880- 2005) Temperature Difference From Normal (°C) Annual Average 5-year Running Average Year http://data.giss.nasa.gov/gistemp/graphs/ Preponderance of Evidence Resource Card 2

  3. Shrinking Glaciers Muir Glacier, Alaska August 1941 August 2004 NSIDC/WDC for Glaciology, Boulder, compiler. 2002, updated 2006. Online glacier photograph database. Boulder, CO: National Snow and Ice Data Center. Preponderance of Evidence Resource Card 3

  4. Increasing Wildfire Risk Western US area burned Source: Westerling et al. 2006 Preponderance of Evidence Resource Card 4

  5. Average Surface Temperature Changes Average Surface Temp in 2001-2005 vs 1951-1980 Preponderance of Evidence Resource Card 5

  6. Keeling Curve - CO2 Concentration Preponderance of Evidence Resource Card 6

  7. Increasing CO2 Concentration IPCC, 2007 Preponderance of Evidence Resource Card 7

  8. Ice Core Records CH4 (ppb) CO2 (ppm) Time (years) Source: Hansen, Clim. Change, 68, 269, 2005. Preponderance of Evidence Resource Card 8

  9. Projected Changes in CA Summer Temperature UCS UCS Preponderance of Evidence Resource Card 9

  10. Species Shifting 1900 >7,800 ft 2004 >9,500 ft Species that are sensitive to temperature conditions can only move up the mountainside as conditions get too warm for them lower down. In the Sierras, Pika were seen at 7,800 feet and above in 1900. By 2004, they were not seen below 9,500 feet. This trend is expected to continue. The mountains rise as high as 12,000 feet, but the rocky hillsides where Pika live do not reach that high. Pika Preponderance of Evidence Resource Card 10

  11. Diminishing Sierra Snowpack Percentage Remaining, Relative to 1961-1990 UCS Preponderance of Evidence Resource Card 11

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