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Global weathering and climate for several timeslices. (a) Total annual silicate weathering flux of Ca + Mg. (b) Contribution of climate, roots and mycorrhizal fungi to silicate weathering fluxes of Ca + Mg. (c) Global mean annual temperature (MAT) and precipitation (MAP). (d) The weathering efficiency of plants (fE) normalized using our modern flux and that of Berner [5,9]. The fE values used in the most recent GEOCARB models [7,9] are shown for comparison.
