I met a British scientist who was researching human cloning. He wanted to clone an embryo, implant it in the womb and cull it for spares for the older twin. Take baby from her at birth. Child remains healthy on one kidney, older twin life is saved. Childless couple get a baby.
Poor mother gets an income.
But I don't want to live in a world like that. And as I say, human cloning poses huge emotional and phyical risks for the younger child .