Evidence strongly supports the claim that Arctic coastal erosion significantly impacts the global carbon cycle and Earth's climate by releasing massive amounts of previously frozen organic carbon into active marine and aquatic systems, thereby fueling greenhouse gas emissions and positive climate feedbacks.
The retrieved papers consistently show that Arctic coastal erosion and permafrost degradation release significant quantities of organic carbon into aquatic and marine environments, where microbial decomposition drives high carbon dioxide and methane emissions that impact the global carbon budget and climate system. Multiple studies specifically highlight coastal erosion and abrupt thaw as major drivers of this permafrost-carbon feedback.