Based on the Al, some drylands are projected to expand and others to contract due to climate change. However, there is no evidence of a global trend in dryland expansion based on vegetation patterns, precipitation and soil moisture, based on the satellite record from the 1980s to the present . The Al will also be of limited use under a changing CO2 environment due to higher water use efficiency by some plants , and it overvalues the role of potential evapotranspiration  relative to rainfall. It also does not account for CO2 impacts on evapotranspiration, and seasonality in rainfall and evapotranspiration. Higher annual
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report