Section 16.5.2.3.4  reports that, under medium warming pathways, climate change risks to poverty would become severe if vulnerability is high and adaptation is low . At and beyond 1.5℃, approximately 200 million people with livelihoods derived from small-scale fisheries would face severe risk, given sensitivity to ocean warming, acidification and coral reef loss . Warming between 1.5°C and 2ºC could expose 330- 396 million people to lower agricultural yields and associated livelihood impacts , due to a high dependency of climate-sensitive livelihoods to agriculture globally . Models project that climate change will increase the number of people at risk of hunger in 2050 by 8-80 million people globally, with the range depending on the level of warming  and SSPs . Higher atmospheric concentrations of carbon dioxide reduce the nutritional quality of wheat, rice and other major crops, potentially affecting millions of people at a doubling of carbon dioxide relative to pre-industrial  . Global ocean animal biomass is projected to decrease on average by 5% per 1℃ increase; hence, a 2.5°C level of warming is associated with ~13% decline in ocean animal biomass, which would considerably reduce marine food provisioning, fisheries distribution and revenue value, with further consequences for ecosystem functioning .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report