 Another concern is that because cloning is an asexual way of reproducing it would decrease genetic variation among offspring and, in the long run, might even constitute a threat to the human race. The gene pool may narrow sufficiently to threaten humanity’s resistance to disease (AMA 1999, 6). In response, it has been argued that if cloning becomes possible, the number of people who will choose it as their mode of reproduction will very likely be too low to constitute a threat to genetic diversity. It would be unlikely to be higher than the rate of natural twinning, which, occurring at a rate of 3.5/1000 children, does not seriously impact on genetic diversity. Further, even if millions of people would create children through cloning, the same genomes will not be cloned over and over: each person would have a genetic copy of his or her genome, which means the result will still be a high diversity of genomes. Others argue that, even if genetic diversity were not diminished by cloning, a society that supports reproductive cloning might be taken to express the view that variety is not important. Conveying such a message, these authors say, could have harmful consequences for society.