I find some of those quotes you posted nonsensical Dr. Grass because we are an omnivorous species. Biologically we have features that are only present in meat eating species which allow us to consume and digest meat.
I'm not saying that it's not possible to have a nutritionally complete diet without meat by the way, I'm just saying it's bollocks to claim that humans were never meant to eat meat at all. However we've vastly increased our intake of meat in a very short period of time (on an evolutionary timescale) which is what is leading to health problems.
Oh and I agree with the environmental concerns. The oceans are a complete disaster waiting to happen (or actually already happening and not enough people are paying attention yet). I'm a fan of commercial fish farming for this reason. And kangaroos would be best for red meat, much more environmentally friendly to farm.
