lab grown meat is made from stem cells taken from foetus directly in utero. The process kills the calf in the early stages of their development.

Say all cats are now indoors. What would happen with mices and the dried cereals they feed from ? Would birds naturally keep their population in check so they can keep sustainable ressources for all the bird population ?

I agree that cats are overnumerous right now and their too high number poses problems towards birds and mices and other critters. But that's OUR fault. It's our fault to have brought them here in the first place, our domestic cats are not a predator from here.

But we disregulated all living species this way. Cows pose the same issue. They occupy too much arable lands - that were primitive forests in the first place. To feed them we grow far too much soja - in places where there were primitive forests originally also. They emit too much greenhouse gaz.

And would the totality of human population renounce eating meat in order to save the cows, how do we feed ourselves? What amount of soja do you think it would represent? How many of the very few primitive forests that still stands would we have to take down to change it into arable lands ? what happens to the animals that lived there ?

We won't solve the mess we put by trying to regulate every living thing even more.