On the face of it, the value of a marine reserve — the equivalent of a national park or wildlife preserve on land — seems obvious. The oceans are in trouble, and setting aside regions of biodiversity, where fishing is strictly limited, if not prohibited, is one of the few effective means of protecting many species at once. But politically, there is nothing simple about creating marine reserves in international waters. Recently, China and Russia succeeded in blocking, yet again, the creation of a large marine reserve in Antarctica.
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