Given that 80% of all agricultural land is used to feed and raise animals
that's not a given, though. about 93% of all soybeans are used by humans, but about 77% of the cropweight is fed to animals. how can this be reconciled? because we press about 85% of the soybeans for oil, and the byproduct is fed to animals. so we can't say 77% of the land used to grow soybeans is used for animals. 93% is for humans. this myopic focus on distilling all facets of the industry into discrete datapoints fails to understand the system as a whole.
edit:
and it should come as no surprise that poore-nemecek has also infected this link as well.