Reasons for the loss of Mangroves

The following a sequence of recent severe disturbing events, with several cyclones in a row (1988, 1991, Sidr in 2007, Nardis in 2008 and Aila 25 may  in 2009 and AMPHAN 20 may in 2020 and the Asian tsunami of 2004), there is concern that the mangroves’ regeneration ability has been weakened. On the Bay of Bengal along the Sundarbans the occurrences of cyclones increased by 26% between 1881 and 2001. Apart from large cyclones such as Aila,  tidal bores and high tides—though a comparatively slow onset is equally destructive—have already started to play havoc on the ecosystem.

The other important and critical change is sea level rise, owing to global warming, anthropogenic drivers, and land subsidence , which eventually affects the mangrove forest and vulnerable, coastal communities. The cumulative effect of this, described as relative mean sea level (RMSL), has risen between 3.14 mm/year  and almost 5 mm/year  in the Sundarbans, which are much higher than global averages, and threaten to inundate close to a billion people .

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