In TFA, there's the argument that human invasion of more and more wildlife habitat has increased the risk for zoonosis:
> Yes. EcoHealth Alliance, an NGO, and others, looked at all reported outbreaks since 1940. They came to a fairly solid conclusion that we’re looking at an elevation of spillover events two to three times more than what we saw 40 years earlier. That continues to increase, driven by the huge increase in the human population and our expansion into wildlife areas. The single biggest predictor of spillover events is land-use change—more land going to agriculture and more specifically to livestock production.
And about meat, there are two issues. One is about impacts of livestock production, and the other is about wildlife consumption.