Delegates from around the world convened in Nice, France, last week to discuss a range of ocean priorities, including the implementation of a recently finalized “high seas treaty” to protect the two-thirds of the oceans that lie outside countries’ control. 

It was the third United Nations Ocean Conference, a high-level forum meant to advance the U.N.’s sustainable development goal to “conserve and sustainably use the oceans.” This year’s co-hosts, France and Costa Rica, urged other countries to step up marine conservation efforts in light of overlapping ocean crises, from plastic pollution and ocean acidification to rising sea levels that are jeopardizing small island nations. António Guterres, the U.N.’s secretary-general, said in his opening remarks that oceans are “the ultimate shared resource” and that they should foster multilateral cooperation.

Whether the conference was a …

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