Climate change in northern regions, including Arctic ecosystems, is causing permafrost to thaw, creating the potential for mercury  to enter the food chain  as methyl mercury , which is highly neurotoxic and nephrotoxic and bioaccumulates and biomagnifies throughout the food chain via dietary uptake of fish, seafood and mammals. Mercury methylation processes in aquatic environments have been found to be exacerbated by ocean warming, coupled with more acidic and anoxic sediments . Consumption of mercury-contaminated fish has been found to be linked to neurological disorders due to methyl mercury poisoning  that is associated with climate change-contaminant interactions that alter the bioaccumulation and biomagnification of toxic and fat-soluble persistent organic pollutants and polychlorinated biphenyls   in seafood and marine mammals . Indigenous Peoples have a higher exposure to such risks because of the accumulation of such toxins in traditional foods . Contamination of food with PCBs and dioxins has a range of adverse health impacts .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report