"We've lost 17 percent of all plant life in the Atlantic, 26 percent in the North Pacific and in the sub-tropical oceans 50 percent or more of plant life has disappeared, " he said.

CNN: Topical waters

He opened a plant in Vietnam, on the tropical island of Phu Quoc, where the small black anchovies are legendary.

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The plant would generate 10 megawatts of power by exploiting natural temperature variations in tropical seas, and unlike other renewable energy sources it would operate nonstop 24 hours per day, 365 days per year.

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