A global-scale meta-analysis estimated a 3-7% yield loss per degree Celsius increase in temperature . Two global-scale studies using multiple global gridded crop models found that growing- season adaptation through cultivar changes offsets global production losses up to 2°C of temperature increase . While these studies do not account for CO2 fertilisation effects, another global-scale study with the CO2 fertilisation effects  showed that residual damage  would start to increase almost exponentially from 2040 towards the end of the century under RCP8.5. The cost required for adaptation and due to residual damage is projected to rise from USD 63 billion at 1.5°C to USD 80 billion at 2°C and to USD 128 billion at 3ºC . All these global studies project that risks and damages are greater in tropical and arid regions, where crops are exposed to heat and drought stresses more often than in temperate regions . There are still large uncertainties in the crop model projections , but these multiple lines of evidence suggest that warming beyond +2℃  will substantially increase the cost of adaptation and the residual damage to major crops . The residual damage will prevail much sooner in currently warmer regions, where the effect of even a modest temperature increase is greater .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report