This idea of re-introducing extinct species isn't so far fetched - watch this TED Talk - it is actually from 2013 which from Stewart Brand.
What do you think of the topic? Is there an extinct species you would want to bring back? If so, why?
Also Stewart Brand is a very unique individual, with very unique ideas - he latest project is called the Long Now Foundation. Take a look at the webpage - what do you think about his perspective? Agree or disagree and why?