Flipping through field notebooks…
|’: There have been about 40 glacial cycles during the f = past 3 million years. Civilization developed during the "Current interglacial that has lasted about 12,000 years. Temperature Glacial 5 5.0 4° 35 a 1 05 0 400,000 Years 4 Million Yea rs Pleistocene H Stone Age | Today's CO, level is higher than it has been for 650,000 years. Temperature (C) mn h& yO 2 Deuterium %eo CO, and temperature are linked. CO, (ppmv) 400 40,000 Years | 200 100 0
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