I've known someone vegetarian except for the occasional bacon sandwich.
To Ygg, yes, the ability to raise in farms is important. It's much more sustainable and energy-efficient to use farm animals than wild, hunted animals. (And some animals are more efficient than others: I generally avoid beef for that reason. Living in the USA there's also a problem of non-medical antibiotic use.)
More sustainable: That doesn't seem readily apparent to me. Say you have a forest where 1000 cubic meters of trees grows every year. How is it not sustainable to harvest 100 cubic meters every year? When it comes to whaling, the amount of whales killed every year doesn't make a dent in the population. You have quotas set with fairly large safety margins, and the whalers aren't even able to harvest the entire quota. That results in a growing Minke whale population. There is zero concern about the robustness of the population of the common minke whale in the scientific community, where it is classified as "Least Concern". The same as, for instance, the white-tailed deer:
White-tailed deer - Wikipedia, the free encyclopedia
More energy-efficient: This definitely isn't open and shut. The minke whales are basically free, so the only real energy cost is the fuel for the ships. That shouldn't be very different from the other fishing operations, which are quite managable.
The carbon foodprint of 5 diets compared | shrinkthatfootprint.com Actually, maybe the whaling is even net positive, because whales eat fish, and managing the population of whales means that you can get increase the quotas on fishing. That means that you can reduce the amount of fish farming, where you have to invest all the energy for the production.
And regarding the use of antibiotic: This is great when it comes to wild game. No antibiotics have been used.
It's next to impossible to police hunting effectively. Fortunately there isn't anything of great value on a moose, otherwise they'd be a big target of poachers, as happens with tigers because of backwards Chinese. (Cultural sensitivity be damned.)
It is currently no challenge to police whaling effectively. It usually only becomes challanging when states with a weak government become involved.
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Would it be okay if one farm raised them as cattle? Do you also oppose the hunting of moose, deer, etc?
Personally, yes. If we're talking from the perspective of dwindling the natural population vs raising and killing, it's akin to cutting down trees in the rainforest vs at a tree farm. The items in the latter have been created for that purpose and are being replenished.
Cutting down the rain forest isn't a problem as long as no more trees are being cut down than grows every year. The issue is that this is basically never done. The trees in rain forests are so slow growing than you'd max be able to cut down a few trees per year, maybe, for it to be sustainable. To ensure that a robust population of wild anmals stays robust, you need to limit the quotas to significantly below the amount of new animals per year. This is done for the moose population and the minke whale population here in Norway, at least.