Economic output by the world's oceans is worth $2.5 trillion a year, rivaling nations such as Britain or Brazil, but marine wealth is sinking fast because of over-fishing, pollution and climate change, a study said on Thursday. "The deterioration of the oceans has never been so fast as in the last decades," Marco Lambertini, director general of the WWF International conservation group, told Reuters of the study entitled "Reviving the Ocean Economy".

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Photo credit: Matt Kieffer (Flickr).