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Protecting areas of ocean from destructive human activity could help prevent climate change, protect biodiversity, and at the same time increase the catch of fish, according to the most comprehensive analysis of its kind. Dr Enric Sala, the lead author and ocean scientist at the National Geographic Society, said: "Ocean life has been declining worldwide because of overfishing, habitat destruction and climate change. "Yet only 7% of the ocean is currently under some kind of protection."