Aug 8 2011: This idea is amazing. Another view could be that the human race has reached its peak in evolution. After gene therapy & modification, we literally rule over diseases/congenital anomalies. Population explosion has begun. On basis of a time line, graphically population would be represented by a j shaped curve. We are approaching the peak of the curve. After the peak, there is only one possibility, a sudden downfall of our species. In that case, either earth would be destroyed, or most probably, a new species will take over the earth. So the crux is that nature always has its own way of controlling life!
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A comment on Conversation: Has the advancement of medicine halted human evolution?