The evolutionist Michael Lynch wrote in the ''Proceedings of the National Academy of Sciences of the United States of America'' in a December 3, 2009 article entitled: ''Rate, molecular spectrum, and consequences of human mutation'' (taken from the abstract):
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"Finally, a consideration of the long-term consequences of current human behavior for deleterious-mutation accumulation leads to the conclusion that a substantial reduction in human fitness can be expected over the next few centuries in industrialized societies unless novel means of genetic intervention are developed." [http://www.pnas.org/content/107/3/961]