Primary boreal and temperate forests also comprised net sources in the period 2001-2019; however, when including all tree age classes, boreal, temperate and tropical forests were net sinks , as growth exceeded permanent forest cover losses , with boreal and temperate forests being much stronger sinks . Estimates of carbon removals from remote sensing may provide more accurate estimates of boreal forest carbon balances than ESMs which overestimate regrowth after timber harvesting and other disturbance . Mortality of the boreal forest in British Columbia from mountain pine beetle infestations converted 374,000 km2 from a net carbon sink to a net carbon source . Modelling suggests that a potential increase in water-use efficiency and regrowth could offset the losses in part of the forest mortality area .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report