The Overlooked Carbon Storage Potential of Tidal Marshes

Introduction

This article highlights groundbreaking research on the carbon storage potential of tidal marshes, one of the world's most productive coastal ecosystems. Drawing on data from more than 3,700 soil cores and a newly developed global tidal marsh map, researchers estimate that tidal marsh soils contain approximately 1.44 petagrams (1.44 billion tons) of carbon within the top meter of soil worldwide. Because these waterlogged, saline environments slow decomposition and limit methane emissions, tidal marshes can store carbon for decades or even centuries. The article emphasizes that protecting existing marshes and restoring degraded wetlands can help prevent the release of stored greenhouse gases while enhancing natural carbon sequestration. Beyond climate benefits, tidal marshes provide critical habitat for wildlife, support fisheries, and improve coastal resilience. The findings strengthen the case for incorporating tidal marsh conservation and restoration into climate mitigation strategies, natural climate solutions, and coastal management planning around the world.