Females cannot sustain pregnancies or even get periods if there is not enough food for them or if they do not have enough body fat. These women who do not have a proper diet are unable to produce children. If the environment is one that has a lack of sustaining qualities and humans get all of their food from the environment then these factors would contribute to infertility.
There are many factors in todays society that affect human fertility. For example, with the surge in the use of cell phones, laptops and other small handheld electronics males today produce 50% less sperm then their fathers did. In addition, there are other factors such as the BPA in most plastics which mimic estrogen, increasing the risk of breast cancer and diminishing sperm counts. For more information on plastics check out this article: http://www.scientificamerican.com/article.cfm?id=plastic-not-fantastic-with-bisphenol-a
Overall, there is much we do today that will affect our human fertility in the years to come.
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