Carbon emissions and removals from forests: new estimates, 1990–2020

摘要: Abstract. National, regional and global CO 2 emissions removals from forests were estimated for the period 1990–2020 using as input country reports of Global Forest Resources Assessment 2020. The new Food Agriculture Organization United Nations (FAO) estimates, based on a simple carbon stock change approach, update published information net from forests in relation to (a) net forest conversion (b) land. Results show significant reduction over study period, mean 4.3 1991–2000 2.9 Gt CO  yr −1 in 2016–2020. At same time, land was significant sink globally but decreased strength study period, −3.5 to −2.6  Gt CO . Combining with forest land, our estimates indicated that globally small source of atmosphere average during 1990–2020, net emissions 0.4 Gt CO exception brief period 2011–2015, when counterbalanced net forest conversion, resulting sink −0.7 Importantly, allow first time the literature characterization decade just concluded, 2011–2020, showing this contribution of forests very small, i.e., less than −0.2 – an estimate not yet reported literature. This near-zero balance nonetheless result large fluxes of opposite sign, namely 3.1 Gt CO by −3.3 Finally, we compared data independently reported countries Framework Climate Change, indicating close agreement between FAO country removals estimates. Data are openly available via Zenodo portal (Tubiello, 2020), DOI https://doi.org/10.5281/zenodo.3941973 , well the FAOSTAT (Food Corporate Statistical Database) database (FAO, 2021a).