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Mangroves shield against global warming
Published in The Saudi Gazette on 04 - 04 - 2011

PARIS: Mangroves, which have declined by up to half over the last 50 years, are an important bulkhead against climate change, a study released Sunday has shown for the first time.
Destruction of these tropical coastal woodlands accounts for about 10 percent of carbon dioxide emissions from deforestation, the second largest source of CO2 after fossil fuel combustion, the study found.
Fewer trees not only mean less CO2 absorbed from the air, but also the release of carbon stocks that have been accumulating in shallow-water sediment over millennia.
Mangroves — whose twisted, exposed roots grace coastlines in more than 100 countries — confer many benefits on humans living in their midst.
The brackish tidal waters in which the trees thrive are a natural nursery for dozens of species of fish and shrimp essential to commercial fisheries around the world.
Another major “ecosystem service,” in the jargon of environmental science, is protection from hurricanes and storm surges. Cyclone Nargis, which killed 138,000 people in Myanmar in 2008, would have been less deadly, experts say, if half the country's mangroves had not been ripped up for wood or to make way for shrimp farms.
The trees stored atmospheric CO2 just as well as land-based tropical forests, they found. Below the water line, they were even more efficient, hoarding five times more carbon over the same surface area.


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