Can the modern Arctic environment really support herds of new mammoths? I know they used to roam the tundra 5,000 years ago, but they've been absent since. Wouldn't their reappearance displace the creatures that have taken their place in the ecosystem? Perhaps moose and arctic ox would suffer a decline? It seems really reckless to me to resurrect long dead creatures and to call that "healing the earth". I don't think…
The most reckless part is resurrecting highly intelligent social creatures. The problem becomes apparent if we look at African elephants - if the matriarch is killed before passing on her knowledge, the herd often dies or disbands. Now imagine just popping a small group of mammoths into existence who never roamed the Arctic tundra and expect them to just "know" how to mammoth. It takes many generations to achieve tha…
That said, presumably they'd rear the baby mammoths with elephants and at least develop social skills, even if they can't develop environmental skills; and then support the animals as they become used to arctic conditions. But would that just the be the equivalent of raising Neanderthals and then transporting them to the wilderness for their Exciting New Life In The Wild?