Cloning is unsafe  The technology is unsafe. The nuclear transfer technique that produced Dolly required 277 embryos, from which only one healthy and viable sheep was produced. [1] The other foetuses were hideously deformed and either died or were aborted. Even today, cloning animals through somatic cell nuclear transfer is simply inefficient. The success rate ranges from 0.1 percent to 3 percent, which means that for every 1000 tries, only one to 30 clones are made. Or you can look at it as 970 to 999 failures in 1000 tries. [2]  Moreover, Ian Wilmut and other commentators have noted that we cannot know whether clones will suffer from premature ageing as a result of their elderly genes. Dolly the sheep herself suffered from premature arthritis. [3] There are also fears that the reprogramming of the nucleus of a somatic cell in order to trigger the cell division that leads to the cloning of an individual may result in a significantly increased risk of cancer.  [1] Barnes, Deborah, ‘Research in the News: Creating a Cloned Sheep Named Dolly’, National Institutes of Health Office Science Education,   [2] University of Utah, Learn Genetics: Cloning,  , accessed 08/20/2011  [3] Kilner J., Human Cloning: What's at Stake, published 08/10/2004,  , accessed 08/20/2011