I might move this thread, depending on how it goes.
I guess this question is less about food and more about other animal products/uses?
Like, if I eliminate leather and wool from my wardrobe, does not the increased use of synthetic material have a detrimental affect on the environment? Are there enough natural alternatives?
Then there's the animal liberation issue ... things like releasing dozens of mink into the wrong environment etc? Could the long term effects of such actions be more detrimental to the conservation of other species?
Do zoos do more good than harm - is the anti-zoo sentiment unhelpful when considering the destruction of natural habitats?
They're obvious issues, but what about other issues like the preservation of indigenous or non-contacted tribes who hunt or depend on animal products for their livelihood? Would it be wrong to encourage them to live in other ways?
Lots of questions - lots of grey areas.