Responsible meat-eating

Mono-cultures and other such things. One could argue that chopping down forests to cover huge swathes of land in soy is not much better than chopping them down and raising cattle. It is better, but growing only a few species of resource-intensive crops is not the best solution to our various land-use/greenhouse gas/water shortage/ecological diversity/etc. issues.

As an example something that people often ponder is whether they're better off eating butter from a local dairy or margarine that is dairy-free but contains palm oil that has been flown over from a different continent. Palm oil has been responsible for massive devastation to rainforests, orangutan habitats and so on