Our planet's vast oceans have been viewed throughout history as an inexhaustible resource, both in terms of what they can produce and what they can absorb. But the ecological limits of oceans became apparent in the past decade. Eleven of the world's 15 most important fisheries, and 70 percent of commercial fish species are now fully exploited or overexploited. And pollution of coastal waters often contaminates many remaining marine species. Worldwatch oceans research examines the policies needed to protect fisheries, keep oceans free of pollution, and ensure the livelihoods of those who make their living from the sea.

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