What should have been rather obvious in the first place is spelled out quite clearly in the Scientific America. Introducing foreign species to a new environment has a very well researched history of failure and of unintended consequences.
However I do believe the USA is in a unique position to offer threatened African species safe havens.... large reserves, perhaps on disused farmland, which are carefully monitored. Things in Africa are probably only going to get worse as Africa awakens and starts to expand it's economic muscle. This will not be a good thing for the megafauna. The African Governments might even pay for it with the hope of reintroducing the creatures once human expansion has been completed... they are after all a huge tourist boost.
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