Even if only 1% of Seaspiracy is true, or if the numbers are off by 99%, the fact remains that we can live perfectly healthily without animal based foodstuff. The only moral and simplest solution is for privileged Westerners to go vegan.
Morality is relative; please don't inflict yours on others. Animal consumption can be made sustainable. The main offenders are beef, lamb, and mutton, and their associated dairy[1]. Cutting just those out would put us back in the ballpark of responsible agriculture. Between pork, poultry, fish & other aquatics, and insects, there's room for sustainable meat farming. [1]: https://ourworldindata.org/environmental-impac…
Suffering is not relative.
“It just isn't possible to mass produce meat without torturing animals. In fact, raising animals specifically for consumption, i.e., “humane slaughter” is an oxymoron.” —https://www.cynicusrex.com/file/cynic.html