Believe it or not, the technology to clone extinct species is in our possession thanks to advancements in genetic engineering, the extraction of DNA from extinct animals, and species alive today that are close enough to be incubators. The animals possible for cloning are ice age species, particularly the ones frozen in ice with minimal damage to their genetic material.
Japanese scientists have created a procedure that can compose broken DNA at 40,000 locations on the DNA of an individual, during each offspring cycle. To clone a Woolly Mammoth, that means about 10 generations and this process would produce a "Woolly Mammoth". The procedure is only good for recently extinct species, our cousins the Neanderthals being another possibility. Of course, a human mother would be required to incubate the cloned embryo.
What do you think about the morality of this? I for one am excited at the possibility, and if I had the "GO!" button I'd press it straight away.
Also, with current technologies, past Genius's like Einstein etc. could be cloned. Of course there are more problems here, but maybe Russia etc. might one day contemplate acquiring a batch of Einsteins DNA as to clone him.