Ah we have ArticMine the Malthusian who apparently religiously (irrationally) subscribes to the fable tale fraud of AGW and r0ach the Mathusian who doesn't appear to be aware that we can grow more food in our basements than we need:
I will give you the benefit of the doubt, as I was talking more about scaling the existing American style diet rather than everyone growing fungus or soylent green in the basement. I guess it's possible we will also stop eating real meat and only grow synthetic meat, but I think no matter what technology does, if population stays the same or increases, we will probably do things like wipe out a majority of life in the ocean for example, and you can't just ignore that because we now have synthetic hamburgers and synthetic fish to replace them.
I have to say on this point your logic is atrocious. If we have synthetic hamburgers and synthetic fish, then it indeed does not matter from the point of view of Malthusian population limits with respect to food that the majority of life in the ocean is wiped out. It may matter for other reasons, but you haven't stated them.