Natural CO2 removal rates as a function of atmospheric CO2 level. The removal rate in PgC/yr is from https://sealevel.info/AR6_WG1_Table_5.1_annot1.png The removal rate in ppmv/yr is calculated as 1 ppmv = 2.1294 PgC/yr The CO2 level at the decade midpoint is from https://sealevel.info/co2.html Decade CO2 Net removal rate mid-yr level PgC/yr ppmv/yr ------ ------- ------ ------- 1984.5 345.61 3.7 1.7376 1994.5 359.965 4.6 2.1602 2004.5 378.84 5.0 2.3481 2014.5 399.91 5.9 2.7707 (399.91-345.61) / (2.7707-1.7376) = 52.56 (399.91-369.965) / (2.7707-2.1602) = 49.05 (399.91-378.84) / (2.7707-2.3481) = 49.86 Conclusion: each 50 ppmv increase in CO2 level accelerates natural removals by about 1 ppmv/year.