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Predicted Late Ordovician (445 Ma) NPP. Result from ecophysiological model of cryptogamic vegetation cover driven by simulated Late Ordovician (445 Ma) climate, atmospheric CO2 = 8 PAL, and atmospheric O2 = 0.6 PAL (14 vol%), with no ice sheet mask. Simulated global NPP = 18.7 GtC⋅y−1.
