Higher temperatures and more frequent extreme heat events around flowering will likely affect phenology. While suitable areas for olive cultivation could extend northward and to higher elevations under the A1B scenario in 2036-2065 , negative consequences for several countries are expected, including southern Spain  and Tunisia  under 2°C warming. Under 1.5°C-2°℃ GWL, olive yields in northern Mediterranean locations could decrease by up to 21% . A 3°C warming could cause a 15-64% drop of production of rain-fed olives in Algeria .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report