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Mombasa hosted the Seagrass Swim on October 26, 2025—a 2km ocean swim where GPS trackers mapped seagrass meadows, vital carbon sinks. Over 400 athletes joined; data aided KMFRI’s blue carbon mapping. Your stroke measures the sea’s lungs, said marine biologist Dr. Salim Ali. Safaricom funded data analysis. UNEP cited it as a citizen science breakthrough. Annual editions are planned.