It is called blue carbon and occurs in coastal habitats and eco-systems where mangroves, salt marshes and seagrass meadows become its repositories. While forests hold most of their carbon within woody biomass, coastal plants pull carbon out of the air and water and channel it through their roots deep into the ground, burying it indefinitely. As a result, coastal plants can absorb many times more carbon than trees covering the same area. The problem is that aquatic eco-systems are disappearing. Mangroves and salt marshes are often removed to allow coastal developments. Fortunately, concerted efforts are being made to restore coastal ecosystems by growing seagrass meadows and by developing techniques to cultivate seagrasses. The good news is that seagrasses have the potential to grow in coastal waters all over the world, except Antarctica (source C. Swanson, Turning carbon Blue, N.S. 05.10.2019)

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