Robots are helping restore lost seagrass meadows | CNN ReefGen is deploying semi-autonomous underwater seagrass planting machines to help repopulate the habitat that serves as a nursery for many marine species and functions as a carbon sink.

Robots are helping restore lost seagrass meadows. ReefGen was formed by Google X cofounder Tom Chi, who witnessed the decline of coral reefs close to his home in Hawaii and turned to engineering and robotics to help

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