Blue carbon explained: how mangroves, seagrasses, and whales store CO2 and protect Brazil's coast

The ocean absorbs about 30% of human CO2 emissions, but a specific part of that storage known as blue carbon comes from coastal and marine ecosystems. Mangroves, seagrass meadows, and even whale populations capture and hold carbon in biomass and sediment for long periods. Brazil holds one of the largest mangrove areas in the world, making blue carbon a practical tool for both climate mitigation and coastal defense. Protecting and restoring these ecosystems does more than store carbon. It supports fisheries, maintains biodiversity, and buffers storm surges and sea level rise. For coastal cities in Brazil, these natural defenses can reduce damage before expensive infrastructure is needed. The article draws on public scientific sources to explain how blue carbon fits into broader climate strategy.