Debates about ocean protection tend to orbit national governments and multilateral treaties. Fisheries quotas, shipping rules, and marine reserves are usually negotiated by states. Yet much of the activity that determines the ocean’s health passes through cities. Ports regulate entry. Municipal buyers decide what seafood is served in schools and hospitals. Urban air-quality rules shape how ships fuel and operate at berth. Taken together, these levers suggest that coastal cities may exert more practical influence over the seas than is commonly acknowledged. Consider the modern port, which is less a waterfront than a complex regulatory zone. Ships cannot simply arrive and unload. They must comply with local safety, environmental, and operational requirements. The ports of Los Angeles and Long Beach, for instance, introduced a Clean Air Action Plan that has pushed shipping lines toward cleaner fuels, shore power, and newer vessels. The primary motivation was urban smog, not marine conservation. Still, the result has been a measurable reduction in greenhouse gases and particulate pollution across one of the world’s busiest maritime corridors. When ports tighten standards, global shipping companies adjust, because the trade is too valuable to forgo. Procurement offers another underappreciated channel. Large metropolitan governments purchase enormous volumes of food for public institutions. If those buyers adopt sustainability criteria for seafood, they can influence supply chains in ways that national policy often struggles to achieve. Several U.S. cities now use guidelines informed by organizations such as the Monterey Bay Aquarium’s Seafood Watch program. In Brazil, reporting revealed that shark…This article was originally published on Mongabay

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