[30] Decline in seagrasses are due to a number of factors including drought, water quality issues, agricultural practices, invasive species, pathogens, fishing and climate change.[31] Over 35% of global mangrove habitat remains. Decreases in habitat is due to damming of rivers, clearing for aquaculture, development etc., overfishing, and climate change, according to the World Wildlife Fund.[32] Nearly 16% of mangroves assessed by the IUCN are on the IUCN Red List; due to development and other causes 1 in 6 worldwide mangroves are in threat of extinction.[33] Dams threaten habitats by slowing the amount of freshwater reaching mangroves.
Quantifying rates of decrease are difficult to calculate, however measurements have been estimated by researchers indicating that if blue carbon ecosystems continue to decline, for any number of reasons, 30-40% of tidal marshes and seagrasses and approximately 100% of mangroves could be gone in the next century.


Distribution and decline of blue carbon ecosystems Global distribution of blue carbon[30] Seagrasses, mangroves and marshes are types of vegetated coastal habitats that cover approximately 49 million hectares worldwide.[30] Seagrass ecosystems range from polar to tropical regions, mangroves are found in tropical and sub-tropical ecosystems and tidal marshes are found in mostly temperate regions such as on the east coast of the United States.[30] As habitats that sequester carbon are altered and decreased, that stored amount of C is being released into the atmosphere, continuing the current accelerated rate of climate change. Impacts on these habitats globally will directly and indirectly release the previously stored carbon, which had been sequestered in sediments of these habitats. Declines of vegetated coastal habitats are seen worldwide; examples seen in mangroves are due to clearing for shrimp ponds such is the case in Indonesia, while in seagrasses there are both natural causes due to pathogens and may be exacerbated by anthropogenic effects.

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