The Missing Sinks - How Our Coastlines Sequester Massive Quantities of Carbon


Stunning new report shows that coastal habitats have the capacity to sequester 50 times more carbon per year in the sediment below them than equivalent sized tropical forests

Washington, DC – Coastal saltmarshes, mangroves and seagrass meadows have a staggering ability to remove carbon from the atmosphere and lock it into soil, a new paper by a Conservation International scientist claims today – prompting calls for urgent action to protect these vulnerable habitats.

In the paper Carbon Sequestration by Coastal Marine Habitats: Important Missing Sinks, Conservation International’s Dr Emily Pidgeon describes how these habitats can sequester up to 50 times more carbon in the sediment below them than equivalent areas of tropical forest.

Dr Pidgeon, Conservation International’s Marine Climate Change Director, said: "The key difference between these coastal habitats and forests is that mangroves, seagrasses and the plants in saltmarshes are extremely efficient at burying carbon in the sediment below them where it can stay for centuries or even millennia. Tropical forests are not as effective at transferring carbon into the soil below them, instead storing most carbon in the living plants and litter. But coastal ecosystems keep sequestering large amounts of carbon throughout their life cycle. Equally, the majority of carbon stays locked away in the soil rather than the plant, so only a relatively small amount is released when the plant dies."

The paper, released today by IUCN in the report The Management of Natural Coastal Carbon Sinks makes a compelling case for the protection of these ecosystems – which occur in areas as diverse as Britain, Australia, the Caribbean, the Mediterranean, and North and South America – and which are being lost at an alarming rate to human activity.

The report was supported by the United Nations Environment Programme (UNEP), The World Commission on Protected Areas (WCPA), Natural England and the Lighthouse Foundation.

Dr Pidgeon said: "Not only do these ecosystems help us to remove carbon from the atmosphere, but they are also very important as an adaptation tool to help some of the world’s most vulnerable people to avoid the worst impacts of climate change. It is imperative that we take steps to protect them immediately."

For example, mangroves are important in protecting coastal communities from extreme weather, and also provide a nursery for many species of fish, which provide greater food security for these populations. Seagrasses prevent coastal erosion and provide habitat for many commercially important species of fish, protecting livelihoods and saltmarshes provide a buffer that prevent sediment from damaging fisheries, and may play a role in protecting freshwater aquifers from salt-water intrusion.

Dr Pidgeon said: "The sheer size of the world’s forests makes them essential for carbon sequestration. However, the immense carbon sequestration capacity of these coastal habitats has been almost completely ignored and may also be a vital component in global efforts to mitigate climate change."


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