Slightly off-topic, but how far are we from producing artificial milk? It would seem like a relatively easy thing to do (at least compared to meat), and with high payoff (vegetarian diet without the ethical and ecological problems of animal dairy).
What I'm really excited for is when milk is being produced in vats with a combination of cow gut bacteria and grass - in theory a mechanical cow's stomach could produce milk that was indistinguishable in taste from real milk but cheaper, cruelty free, cleaner, etc.
Or human milk?
Or some kind of adult-biased version of human milk?
Oh wait, yeah. Soylent, Huel, Mana, 100%Food etc. etc. etc. are effectively "artificial milk for adult humans", at least in their liquid forms rather than the ones who sell packaged meal bars as well.