Hint: we are already screwing with the ocean on a mass industrial scale. The question should be whether there is a way for any given activity to help mitigate the more harmful of those effects.
Changing nothing is actively harmful, and anyway impossible. Human activity is big enough that the only responsible course available is stewardship.
Literally all actors are doing whatever they like, today.
Most particularly, they are dissolving gigatons of CO2 into surface water, acidifying it.
Besides that, a few are trying to control overfishing in coastal waters they have asserted a day over, with varying levels of success, both externally and domestically, subject to politics.
Changing nothing is actively harmful, and anyway impossible. Human activity is big enough that the only responsible course available is stewardship.