Net anthropogenic CO2 emissions from land use, land-use change and forestry (CO2-LULUCF) are subject to large uncertainties and high annual variability, with low confidence even in the direction of the long-term trend.9 (Figure SPM.1) {Figure 2.2, Figure 2.5, 2.2, Figure TS.2} B.1.3 Historical cumulative net CO2 emissions from 1850 to 2019 were 2400 ± 240 GtCO2