| Activity 1: Keeling’s Data on CO2 levels in the West
| Location | Date(s) | Elevation (m) | CO2 Min (ppm) | CO2 Max (ppm)
1 | Coastal Redwood Canyon, CA | June 6-7, 1956 | 150 | 335 | 384
2 | Olympic Rain Forest, WA | Sept. 6-7, 1955 | 170 | 308 | 404
3 | Coastal Redwood Valley, CA | May 18-19, 1955 | 70 | 316 | 389
4 | Coastal Redwood Valley, CA | June 5-6, 1956 | 70 | 314 | 374
5 | Sierra Nevada Pine/Fir Forest, CA | June 2-3, 1955 | 1950 | 313 | 364
6 | Sierra Nevada Pine/Fir Forest, CA | June 10-11, 1956 | 1950 | 314 | 357
7 | Mogollan Rim Pine Forest, AZ | May 16-17, 1956 | 2100 | 316 | 326
8 | Cascade Mtn. Divide Forest, WA | Aug. 31-Sept. 1, 1955 | 1900 | 307 | 321
9 | Sierra Nevada, CA | June 3, 1955 | 2500-3000 | 314 | 318
10 | Southern California beach | June 22, 1955 | 0 | 313 | 315
11 | Inyo Mtns., CA | July 8-9 1955 | 3800-4300 | 312 | 319
12 | Washington beach | Sept. 6-7, 1955 | 0 | 309 | 310
13 | Southern California bay (aircraft) | Nov. 27, 1955 | 0 | 315 | 315
14 | Borrego Desert, CA | Jan. 31-Feb 2, 1956 | 340 | 311 | 318
15 | Inyo Mtns., CA | Mar. 9-14, 1956 | 3800 | 315 | 318
16 | Sonoran Desert, AZ | Apr. 21-22, 1956 | 550 | 314 | 320

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