Why would anyone think that? The ecosystems of the seas and the oceans have functioned normally for 100s of millions of years with the first complex life forms evolving some 560 million years ago and with the first fish appearing 530 million years before present, https://ocean.si.edu/through-time/ocean-through-time.
Then along comes a monkey, the human primate, a creature that evolved from the water who then, in very recent history, compared to life in the seas and oceans comes up with the idea for a boat. The concept is copied innumerable times as the monkey finds it likes to eat or use many of the life forms that live in the watery environment but without consideration to what this will do to those ecosystems.
Part of his expansion in numbers is very much down to this exploitation without consideration of this environment. After all, teach a man to fish and not only will he have many children who will also want to fish but he will go to extraordinary lengths to feed his pets and also, to force feed his herbivore farm animals some fish before he eats them.
Then some of those who were fishermen become managers and management consultants who came up with the idea that what is needed is a bigger boat, a factory boat and a huge processing plant to distribute what appears to be seas and oceans that have no bounds. Queue repeating this plunder of the watery environment without consideration as to the consequences.
Meanwhile below the surface where most of the monkeys cannot see or are not looking the ecosystems are trying to adapt to this day in day out onslaught as ecosystems do. On the surface the monkey is now squabbling over who, where and when the fishermen monkeys can fish and all the while the fishermen monkeys have more fishermen children. Think about what we are doing in a non human centric point of view and you will see that it is not going to end well.
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