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. 2002 Feb 5;99(3):1389–1394. doi: 10.1073/pnas.012249999

Figure 2.

Figure 2

Estimated average annual air-to-ground net flux in Pg C⋅y−1 from 1700 to 1990. Positive values indicate a land sink and negative values indicate a source to the atmosphere. Light line, ref. 6 without fire suppression. Dark line, ref. 6 with fire suppression. Dark line with ⧫, ED.