NUNATARYUK will determine the impacts of thawing coastal and subsea permafrost on the global climate, and will develop targeted and co-designed adaptation and mitigation strategies for the Arctic coastal population. Specifically, it will: 1) develop quantitative understanding of the fluxes and fates of organic matter released from thawing coastal and subsea permafrost; 2) assess what risks are posed by thawing coastal permafrost, to infrastructure, indigenous and local communities and people’s health, and from pollution; 3) use this understanding to estimate the long-term impacts of permafrost thaw on global climate and the economy. NUNATARYUK will be guided by a Stakeholders’ Forum of representatives from Arctic coastal communities and indigenous societies.