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Fujitsu is developing underwater drones to enhance the blue carbon credit market by measuring carbon absorption in coastal ecosystems. These drones can scan the ocean floor to identify CO2-sequestering plant species, aiding in carbon capture estimations. Despite challenges like high costs and measurement uncertainties, Fujitsu's technology aims to bolster investor confidence and expand the market from 3.1 million tons of CO2 credits to 40.5 million tons by midcentury.