The oceans have become so depleted by over-fishing, pollution and climate change that they can only be saved by a large global network of reserves, according to a growing consensus among marine scientists.
Campaigners say that sea life -- particularly at the top of the food chain -- is suffering to such an extent that there will eventually be no fish left if action drastic action is not taken to protect the oceans.
More than 70 percent of the world is covered by oceans. There are currently more than 4,000 marine protected areas covering just over 1 percent of the oceans, but the vast majority of reserves have only limited protection.
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