There's a lot of risk involved. The researchers will test their approach using southern rhinos as surrogates, but a complicated procedure (the females need to be anaesthetized for two hours) and a limited amount of northern sperm (just four dead males) doesn't give the scientists many chances. If they run out of supply or the northern rhinos meet an untimely end, there may be no going back. The limited genetic variety would also cause problems -- it could take a long, long time (if it can happen at all) before there would be enough diversity to ensure a flourishing population.
Still, there's plenty of hope. The research unit is hoping that stem cell technology can create more eggs and sperm from the skin cells of 12 northern whites, increasing the supply and genetic variety. They also don't think it will take too long to add to the species: they hope to witness the first northern white birth in three years, and that's accounting for the rhino's 16-month pregnancy period. If the scientists pull it off, they'll both rescue a seemingly doomed animal and provide a blueprint for protecting other animals teetering on the edge of oblivion.