Some severe impacts are already occurring  and will occur in many more systems before mid-century . Tropical and polar low-lying coastal human communities are experiencing severe impacts today , and abrupt ecological changes resulting from mass population-level mortality are already being observed following climate extreme events. Some systems will experience severe risks before the end of the century , for example critical infrastructure affected by extreme events . Food security for millions of people, particularly low-income populations, also faces significant risks with moderate to high warming or high vulnerability, with a growing challenge by 2050 in terms of providing nutritious and affordable diets . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report