The fertility of men and women withdraw. What will happen to the world by 2100?

A recent study has shown that fertility rates in almost all countries will be very low, so that they cannot maintain the population by the end of the century, and that most living births around the world will be out of the poorest countries, according to “Lancet” magazine. Researcher Stein Emile Volsit, from the Institute of Health and Evaluation at the University of Washington in Sayattle, said in a statement that this tendency will lead to the division of the world between a ‘birth behavior’ and a ‘birth of birth’, and the boom in countries with low income will be the most vulnerable to economic and political instability. Less fertility rates and the study expect 155 out of 204 countries and regions around the world, at 76%, by 2000 fertility figures will have lower than population replacement levels. By 2100, the number is expected to rise to 198, according to the researchers’ estimate. Expectations are based on surveys, census and other data sources collected from 1950 to 2021 as part of the study of the global burden of diseases, injuries and risk factors. Researchers have said that more than three -quarters of living births will be in low and medium income by the end of the century, and that more than half of it will be under Saharan. The data shows that the global fertility rate, the average number of births for each woman, dropped from about 5 children in 1950 to 2.2 in 2021. By 2021, he had 110 countries and regions, or 54% of the countries of the world, which is lower than the level of replacement of the population of 2.1 children per woman. The study highlights a particularly concerned tendency for countries such as South Korea and Serbia, where the fertility rate is less than 1.1 children for each woman, exposing her to challenges associated with shrinking the workforce. Other reasons, researchers have always been busy with fertility issues and factors affecting birth opportunities. Previous research has shown that smoking, whether by a man or a woman, reduces the possibility of pregnancy. According to “Mayo Clinic”, research indicates that women who smoke more than 10 cigarettes a day are less likely to wear during a single menstrual cycle; It also indicates that the possibilities of women’s pregnancy in laboratory fertilizer courses are less than smoking with others. The possible causes of the relationship between smoking and poor fertility include changes in the fallopian tubes and cervix, and damage to the sex cells. Abortion is more frequent in women -smokers. Smoking was also linked to early menopause, a natural biological process indicating the end of fertility. In men, smoking can increase the risk of a decrease in the number of sperm.