Chimeras: human stem cells grown in pigs for creation of transplantable organs for humans.
Couple thoughts: 1) if human over-populatuon is a thing, and if it leads to man-made climate change (assuming this is also a thing,) is it ethical to seek ways for diseased humans to live longer?
2) If Chimera-produced organs become availabe, will they be distributed based on ability to pay?
3) Would it be more cool to finally have a griffin, or some other mythilogical chimera produced?
While I know it is easy to say when it isn't someone important to you personally, perhaps we would be better off using our limited medical expertise, time, and money on those for whom the benefits would be greatest. I don't even pretend to know how this would be administered. Would a heart transplant be better for an eighty year old man/woman or, would a transplant be better for someone younger, say thirty?
The well being or happiness of the individual should not be viewed in the context of the size of the population. Those are two separate issues. Certainly both issues deserve, and the latter requires, attention, but neither demands that we abandon concern for the well being of individuals. Population control should not include denial of transplantable organs to individuals who need and can accept them. As to the matter of chimera, based upon your use of the term, it is not clear to me that you understand its meaning, but that is a collateral matter.
All of these questions/issues will become moot in the not too distant future as global economies collapse and industrialized societies collapse. Mass starvation including in the USA, Europe, and Japan will take its toll as will increasing deaths from natural disasters and wars. Human population worldwide will plummet by the end of this century.
Also, over-population and man-made climate change are real things. There's no need to assume.