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480 - <br />480 — <br />440 — <br />420 — <br />400 — <br />380 - <br />360 - <br />340 <br />320 — <br />300 — - <br />280 — <br />260 <br />240 <br />220 <br />200 <br />180 <br />160 <br />For millennia, atmospheric carbon dioxide had never been above this line <br />8001000 700,000 600,000 500,000 400,000 300,000 <br />years before today (0 = 1950) <br />200,000 100,000 <br />-*--- current level <br />J 1950 level <br />