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Should we worry about the oceans losing oxygen? Hypoxia tends to precede mass extinctions. It was crabbers who first reported something amiss. In 2002, they began pulling in traps full of corpses. (Crabs should be alive when you catch them.) And they mentioned something else: Little octopuses had followed their crab lines to the surface, as if fleeing inhospitable conditions below. Then heaps of dead crustaceans bega