Interesting assertion, less shallow than the article's premise, is that Guns, Germs, and Steel (and other research) asserts pet ownership significantly increase

Interesting assertion, less shallow than the article's premise, is that Guns, Germs, and Steel (and other research) asserts pet ownership significantly increases human immune response. Does that mean more humans consuming more cattle, or less illness-driven carbon emissions? It's super complicated to assess all the alternatives, I guess.