Underwater macroalgae forests have the potential to sequester carbon and help mitigate climate change. Research shows that most studies focus on how carbon is fixed by macroalgae, but there is limited understanding of how this carbon is stored long-term. By categorizing coastlines based on their carbon sequestration potential, we can better assess the impact of macroalgae forests on climate change. Conservation and restoration efforts on these forests could remove significant amounts of carbon globally, contributing to overall climate change mitigation efforts. Further research is needed to accurately estimate the amount of carbon sequestered by macroalgae and improve carbon accounting methods.