In San Diego, California, US, land managers started the San Diego Bay Native Oyster Living Shoreline project to prevent erosion and restore wetlands. As part of the project, they are placing hundreds of reef balls along the shoreline to form the foundation of a native-oyster reef. The reef balls are made out of ‘baycrete’, a concrete mixture made with local sand and the shells of farmed oysters. These attract wild oysters, which come to live there. In a couple of years, native oysters will cover the reef balls, forming an artificial reef offshore, which will cause storm waves to break father from the shoreline and protect the adjacent salt marsh. Living shorelines are an important part of sequestering carbon to combat climate change.

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