Climate change including increases in frequency and intensity of extremes have reduced food and water security, hindering efforts to meet Sustainable Development Goals . Although overall agricultural productivity has increased, climate change has slowed this growth over the past 50 years globally , related negative impacts were mainly in mid- and low latitude regions but positive impacts occurred in some high latitude regions . Ocean warming and ocean acidification have adversely affected food production from shellfish aquaculture and fisheries in some oceanic regions . Increasing weather and climate extreme events have exposed millions of people to acute food insecurity" and reduced water security, with the largest impacts observed in many locations and/or communities in Africa, Asia, Central and South America, Small Islands and the Arctic . Jointly, sudden losses of food production and access to food compounded by decreased diet diversity have increased malnutrition in many communities , especially for Indigenous Peoples, small-scale food producers and low-income households , with children, elderly people and pregnant women particularly impacted . Roughly half of the world's population currently experience severe water scarcity for at least some part of the year due to climatic and non-climatic drivers .  
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report