‘Let me make this clear. I am not advocating a vegetarian diet for ethical or health reasons, although those are relevant. I’m simply saying that the day is coming in the lifetimes of many now alive when it will be unavoidable. And the more converts to Quarter-Pounders that McDonald’s makes around the world, the sooner the chicken, so to speak, will come home to roost.’
http://blogs.suntimes.com/ebert/2012/09/well_have_to_get_used_to_this_.html#more