Most CMIP6 models simulate direct CO2 effects on plant transpiration, which has been shown to be a strong influence on projected future changes in soil moisture . Approaches that neglect this process project greater decreases in soil moisture availability than the climate models . Therefore, although several studies project increased global aridity and dryland expansion , these may overestimate future drying . Nevertheless, land surface models, including vegetation responses to CO2, still project reduced soil moisture in many regions .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report