Look up the North Atlantic Cod Fishery. We failed to tell fishermen to stop fishing, and as a result the entire ecosystem collapsed and has never returned. They had to stop fishing anyway, and their way of life collapsed too.
Its a tricky reality to balance, but the fishing industry have historically always gotten this wrong. At a certain point you have to be willing to tell people that their way of life is unsustainable.
Of course, then we have to recognize that most of us live an unsustainable way of life, fishermen just happen to be living unsustainably in a shorter term than the rest of us.
The trick isn't to avoid all suffering, that's just not possible. The trick is (IMHO) to first understand it, then minimize it. Homer Alaska guy will have to accept reduced income for at least a few years until the population rebounds. In the end, at least his business, home, and way of life aren't completely destroyed.
I don't know how we establish/create an independent and reasonable regulator to manage limits, but that's what we need to figure out. The existing entities are too corrupt and have proven that they can't be trusted. On the flip side, some environmental groups are too extreme and also not trustworthy regulators. It's a very hard and complex problem.
If you've ever tried telling an Evangelical that taking this whole Jesus thing so seriously is maybe not the best idea for humanity then you know what I mean.