TS.D.5.2 The projected future effectiveness of available adaptation for agriculture and food systems decreases with increasing warming . Currently known adaptation responses generally perform more effectively at 1.5°C than at 2°C or more, with increasing risks remaining after adaptation at higher warming levels . Irrigation expansion will face increasing limits due to water availability beyond 1.5°C , with a potential doubling of regional risks to irrigation water availability between 2°C and 4°C . Negative risks even with adaptation will become greater beyond 2°C warming in an increasing number of regions .  
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report