Earlier quoted context omitted.
> I think that in the future societies will look back at our consumption of meat, especially factory farming methods, and wonder why it took us so long to change our attitudes on this issue. How would future societies propose we feed ourselves if we don't eat meat?
You can eat plants perfectly fine which in addition is much easier on the environment. At a minimum meat consumption could be reduced a lot.
if everybody eats plants we would also need a huge amount of water/field sizes to feed everybody. guess the best thing is a healthy mix of everything.