"About 99 percent of animals raised for slaughter in the U.S. come from factory farms, and about a third of the land mass of the Earth is used in raising livestock."
Surprised this isn't being discussed more.
Also surprised I'm not seeing a prevalence of 'well, I eat free-range/organic' remarks. Considering that free-range/organic requires MUCH MORE space, where are we going to keep these animals? Let's assume the space for free-range/organic is just a factor of 10 more...we're already using 1/3rd of the land in the US for the existing, efficiently-raised factory-farmed animals. If they need 10x more space, where will that be? The moon isn't even big enough for all the land that'd be required.