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A simple way to help save ocean life, literally save it, is to stop eating it. Unless a person lives in a culture where he or she absolutely must eat fish to survive, then that person can stop eating fish.
I know, it's a crazy suggestion and people won't do it. But I haven't eaten fish since 1983, and millions of other people around the world do likewise. It is possible; it's just a matter of choosing to do so.
What will probably happen, though, is that we humans will fish the oceans dry. Ocean life will crash, with predictably dire results for life on land (that's us). Meanwhile, there will be no real action on global climate change. People will continue overpopulating the planet and taking increasingly scarce habitat from the larger non-human species, and they will disappear. We'll deplete fresh water supplies and relentlessly poison what fresh water we have left. Wars and starvation and plague will be the logical outcome (am I missing a horseman? Ah yes...death). And one day, a future dying generation will curse us, and rightfully so.
There are solutions to the problems facing us, but we will not enact them. So it goes.