It's said that a human clone might age prematurely, like Dolly the sheep. But the same bleaters against human cloning don't want sheep cloning either - they want to stop the research that would best enable these matters to be ironed out. Another concern is that an Adolf Hitler might be cloned. That's absurd on its face - if it weren't we wouldn't pass judgement on him the way we do. Scientists, as I say, have always had to contend with religionists who object to tampering with nature in any way.
Environmentalism is the new face of the religionists.
To my mind, nature is only valuable if it serves man's needs. For the sake of our own survival, it must be tamed, cut, curbed, controlled.