Recently, in the coastal waters of Ha Long City, the study showed that due to the development of economic activities and social drastically increases the toxic substances such as oil, sediment, sewage, narrowing area area or degrade coastal ecosystems here as mangrove ecosystems, coral ,.
On the other hand, the pollution also reduces the quality of the group of organisms of economic value due to accumulation of toxins (heavy metals ...) In the body.
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