350 300 250 200 Carbon dio xide 800 600 400 200 0 ... - Antoine Bret

800. 600. 400. 200. 0. Age (thousands of years). 800. 700. 600. 500. 400. Methane. –8. –4. 0. 4. Tempe ratu re (. C). 380. 360. 340. 320. 300. 280. Carbon dio.
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800

Carbon dioxide

Carbon dioxide Temperature (˚C)

0 –4 –8

380

1,800

360

1,600

340

1,400 1,200

320

1,000

300

800

280

600 400

600

Nature, Vol 453, p 292,15 May 2008

400 200 Age (thousands of years)

0

1,500 1,000 500 0 Years before 1950

Methane

4

800 700 600 500 400

Methane

350 300 250 200