The reasons mangroves have been disappearing so much may sound ridiculous, but they can be very convincing. It could be simply for urbanization, so that we could have more tourists and more people living here. It could be for agricultural purposes, so they can make the landscape the way we want it. Or maybe it could be because of aqua-cultural purposes because the people want a new pond by the new condo. Mangroves can also disappear because they are being used for timber, charcoal, or fuel, and also to prevent freshwater and tidal flow. Oil pollution, or just pollution in general, can also make mangroves die. And these are just some of the human causes. There are also invasive species and climate change that kill mangroves, which is why we need to double our efforts to save them, before they are all gone.
http://ocw.unu.edu/international-network-on-water-environment-and-health/unu-inweh-course-1-mangroves/Degradation-and-destruction-of-mangroves.pdf
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