Climate change is increasing the number of people experiencing food insecurity through greater incidence and severity of climatic impact drivers ,  such as extreme heat, drought and floods. Increasing CO2 concentrations have positive effects on food and forage crops by enhancing photosynthesis and alleviating drought stresses  but have negative effects on nutrient concentrations in food crops. Ocean acidification is also caused by increasing CO2, causing negative impacts on aquatic systems. Tropospheric ozone concentrations already hinder crop production . Several CIDs increase the number of people experiencing food insecurity  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report