Drought conditions  are expected to substantially worsen in global drylands, driven by a higher saturation threshold and more intense and frequent dry spells under rising temperatures . In a +1.5℃ world, historical 50-year droughts ) could occur twice as frequently across 58% of global landmasses relative to the 1976-2005 period, an area that increases to 67% under 2°C warming . Multi-year drought events of magnitudes exceeding historical baselines will increase by 2050 in countries with drylands including Australia, Brazil, Spain, Portugal and the USA . The magnitude of drought stress in different regions differs depending on the metric used. Projections based on the PDSI suggest drought stress will increase by more than 70% globally, while a substantially lower estimate of 37% is found when precipitation minus evapotranspiration  is used . However, the two metrics agree on increasing drought stress in regions with more robust decreases
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report