Cumulative Photosynthesis Deficit
Carbon pooled in photosynthesising biota is 560 GtC (Schlesinger, 1991). Carbon released by deforestation between 1850-2000 is 156 GtC (Haughton & Hackler, 2002), reducing the total photosynthesising biomass to 540 GtC in 2000.
Reduction in photosynthesis between 1850-2000: 156 / (540 + 156) = ~22%
120 = (100-22=78)% of 154 GtCpa - a difference of ~34 GtCpa in 2000
Given the increase of 0.5 GtCpa over the past eight years since 2000, this figure would be closer to 38GtCpa in 2008.
Read more about this topic: Carbon Budget
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