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A hawksbill sea turtle swimming over a coral reef in Curacao, Netherlands Antilles. Oceans are a key ecosystem under threat, according to the United Nations. (Wild Horizons/Universal Images Group via Getty Images) At a Glance World Environment Day is marked every year on June 5.The UN is launching a "Decade of Ecosystem Restoration."The agency is calling on citizens to get involved. From the highest mountains to the aridest deserts and the deepest oceans, the United Nations is calling on governments,...