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Cited as Bill McKibben interview, Dec. 10, 2009.
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Bill McKibben interview · 10 December 2009
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It was about 275 parts per million[ppm]or 0.0275%. … Civilization flourished.” [Bill McKibben interview, Dec. 10, 2009.] Today CO2 is at 425 ppm [0.0425%], for a 50% increase in its concentration.
April 2026 – Stable Climate: In Balance; Today: Imbalanced April 2026
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