The destruction of coastal areas not only affect the ecosystem, but also affects the health of our environment. With our coast polluted from human beings, we have gone to the extinction of hydro animal plus fishes are essential for other nutrients and protein.
Another thing is that we cannot use the water from the ocean if it is polluted and bathing in beaches will make our body sick.
Corals destroyed, are a danger to many water creatures because almost half of them use them for protection. Dynamite fishing destroys corals up to 100m radius.
Without coastal resources, we will die of lack of needs.