Read & Explain Evidence Activity Students divided into groups. There are 8 different evidence cards (ppt slides). First, read it. What’s it say? Then, explain it. What’s it mean? 1. Discuss the data or observation shown on the card. 2. Be ready to describe this evidence to the class. 3. How might this evidence be interpreted? 4. Write your group-thoughts for 2 & 3 on the notesheet. 5. Listen and jot notes on all the other evidence on notesheet.

1. CO 2 Concentration Curve Preponderance of Evidence Resource Card 2

2. Temperature ( ) Year Temperature Difference From Normal (°C) Preponderance of Evidence Resource Card 3

Muir Glacier, Alaska NSIDC/WDC for Glaciology, Boulder, compiler. 2002, updated Online glacier photograph database. Boulder, CO: National Snow and Ice Data Center. August 1941August Shrinking Glaciers Preponderance of Evidence Resource Card 4

Source: Westerling et al Western US area burned 4. Increasing Wildfire Risk Preponderance of Evidence Resource Card 5

Source: Hansen, Clim. Change, 68, 269, Ice Core Records 5. Ice Core Records Time (years) CH4 (ppb) CO2 (ppm) Preponderance of Evidence Resource Card 6

UCS 6. Projected Changes in CA Summer Temp. Preponderance of Evidence Resource Card 7

2004 >9,500 ft 1900 >7,800 ft Pika 7. Species Habitat Shifting 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 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. Preponderance of Evidence Resource Card 8

8. Diminishing Sierra Snowpack Percentage Remaining, Relative to UCS Preponderance of Evidence Resource Card 9