has been estimated to stem from natural ecosystems, especially in the Tropics , while freshwater wetlands and peatlands are estimated to contribute between 83%  and 40%  of total natural CH4  for the period 2008-2017 . Median CH4 emissions from northern-latitude wetlands in 2100 were estimated to be 12.1 and 13.5 PgC in emission scenarios leading to 1.5℃ and 2℃ warming, respectively . Likewise, global warming has been attributed to soil N2O emission increases since the pre-industrial period of 0.8  TgN yr1 . Overall, climate feedbacks from future altered land ecosystem emissions of CH4 or N20 are uncertain, but are expected to be small .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report