Question

how do the international institutions ensure that no country is using exclusive economic zone without their concurrence

Answer 1

Life itself arose from the oceans. The ocean is vast, covering 140 million square miles, some 72 per cent of the earth's surface. Not only has the oceans always been a prime source of nourishment for the life it helped generate, but from earliest recorded history it has served for trade and commerce, adventure and discovery. It has kept people apart and brought them together. Even now, when the continents have been mapped and their interiors made accessible by road, river and air, most of the world's people live no more than 200 miles from the sea and relate closely to it. Freedom of the Seas The oceans had long been subject to the freedom of-the-seas doctrine - a principle put forth in the 17th century, essentially limiting national rights and jurisdiction over the oceans to a narrow belt of sea surrounding a nation's coastline. The remainder of the seas was proclaimed to be free to all and belonging to none. While this situation prevailed into the twentieth century, by mid-century there was an impetus to extend national claims over offshore resources. There was growing concern over the toll taken on coastal fish stocks by long-distance fishing fleets and over the threat of pollution and wastes from transport ships and oil tankers carrying noxious cargoes that plied sea routes across the globe. The hazard of pollution was ever present, threatening coastal resorts and all forms of ocean life. The navies of the maritime powers were competing to maintain a presence across the globe on the surface waters and even under the sea. United Nations Law of the Sea Convention (UNCLOS) The United Nations has long been at the forefront of efforts to ensure the peaceful, cooperative, legally defined uses of the seas and oceans for the individual and common benefit of humankind. Urgent calls for an effective international regime over the seabed and the ocean floor beyond a clearly defined national jurisdiction set in motion a process that spanned 15 years and saw the creation of the United Nations Seabed Committee, the signing of a treaty banning nuclear weapons on the seabed, the adoption of the declaration by the General Assembly that all resources of the seabed beyond the limits of national jurisdiction are the common heritage of mankind and the convening of the Stockholm Conference on the Human Environment. The UN’s groundbreaking work in adopting the 1982 Law of the Sea Convention stands as a defining moment in the extension of international law to the vast, shared water resources of our planet.  The convention has resolved a number of important issues related to ocean usage and sovereignity, such as: Established freedom-of-navigation rights Set territorial sea boundaries 12 miles offshore Set exclusive economic zones up to 200 miles offshore Set rules for extending continental shelf rights up to 350 miles offshore Created the International Seabed Authority Created other conflict-resolution mechanisms (e.g., the UN Commission on the Limits of the Continental Shelf) Protection of marine environment and biodiversity The United Nations Environment Programme (UNEP), particularly through its Regional Seas Programme, acts to protect oceans and seas and promote the environmentally sound use of marine resources. The Regional Seas Conventions and Action Plans is the world's only legal framework for protecting the oceans and seas at the regional level. UNEP also created The Global Programme of Action for the Protection of the Marine Environment from Land-based Activities. It is the only global intergovernmental mechanism directly addressing the connectivity between terrestrial, freshwater, coastal and marine ecosystems.   The United Nations Educational, Scientific and Cultural Organization (UNESCO), through its Intergovernmental Oceanographic Commission, coordinates programmes in marine research, observation systems, hazard mitigation and better managing ocean and coastal areas. The International Maritime Organization (IMO) is the key United Nations  institution for the development of international maritime law.  Its main role is to create a regulatory framework for the shipping industry that is fair and effective, universally adopted and universally implemneted