What are the threats the estuary faces?

Threats to an estuary is a threat to our lives (also many other organisms on the earth).
Ever increasing huge human population that is settling around estuaries and misusing them in many ways:

disposing sewage and household wastes

disposing dangerous industrial effluents with hazardous chemicals into estuaries

using shallow water estuaries for agricultural and aquacultural purposes

constructing barricades and dams

heating up earth’s atmosphere by pumping out greenhouse gases more and more, thereby inviting sea level rise, which will engulf the estuaries and deltas

collecting all the larval fishes and shrimps for the aquaculture farms – overexploitation of the fishery resources