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< p> Man's fertility for the last half a century promptly falls. The authors of the study, which appeared in the scientific journal Human Reproduction Update, are based on an analysis of data collected by scientists around the world over 46 years — from 1973, when this topic began to be studied systematically, and until 2018. Epidemiologists Hagay Levin of the University of Jerusalem, Shanna Swan of the Mount Sinai School of Medicine in New York, and several other colleagues have summarized the results of several hundred studies on this topic. The data covers more than 50 countries.
Over these few decades, the average concentration of gametes in the sperm of men as a whole has more than halved — from 101 million per milliliter to 49 million per milliliter. At the same time, fertility is declining at an accelerating rate.
In the last quarter of the 20th century, the average global rate of decline in fertility was slightly more than 1% (1.16%) per year, but this figure has more than doubled since the beginning of the 21st century. By 2018, the decline was more than 2.5% (2.64%). “If action is not taken, it may threaten the survival of mankind,” — says one of the authors of the meta-analysis, Khagay Levin.
There are several reasons for such a rapid decline in fertility. These are lifestyle changes associated with low mobility, nutritional quality, and environmental factors associated with air pollution, the growing use of various medicines and the ubiquitous presence of a number of synthetic substances in the environment and the food chain. Particularly noted are plasticizers and pesticides.
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