Well, it's not as if the surrogacy would continue indefinitely, putting a continuous strain on elephant reproduction. They would need surrogates only long enoug

Well, it's not as if the surrogacy would continue indefinitely, putting a continuous strain on elephant reproduction. They would need surrogates only long enough to establish a breeding mammoth population, and there's even the possibility that, should elephants get even nearer extinction, future mammoths could return the favor, so to speak, by performing as surrogates themselves. If, as I've been told, grasslands are a better carbon sink than taiga, and mammoths are capable of converting the latter into the former, I'm hopeful for efforts like this.