The decline of fertility rates in industrialized countries are generally attributed to family planning decisions not necessarily toxins. In industrial societies where women have more opportunities for education and economic independence, starting a family often is put off till later in life. Women are born with all the ovum or eggs that they will ever have and these degrade with time. So when a woman waits later in life to start having children the likelihood of having viable ovum to be fertilized is reduced. Furthermore, active family planning also means that families can simply choose to focus their resources on having fewer children. Fertility rates in developing countries are still quite high, where these factors are not so prevalent. To see a graphic representation of this phenomenon check the link below.
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