'Spermageddon': global decline in sperm count could threaten humanity

'Drastic shift' linked to environmental factors including pollutants and chemicals, and lifestyle issues such as obesity

Photo collage of three vintage engravings of sperm under microscope. In each progressive image, the quantity of spermatozoa decreases and the image becomes more faded
If the decline continues at the current rate, the median sperm count would reach zero by the mid-2040s, researchers say
(Image credit: Illustration by Julia Wytrazek / Getty Images)

Men's sperm counts have more than halved over the past 50 years, with potentially drastic consequences for the future of the human race. 

About one in six adults worldwide experience infertility at some point, according to the World Health Organization, and between 30% and 50% of cases are linked to problems with the quantity and quality of semen, said New Scientist. Either the total number of sperm is too low, or the cells "struggle to swim" (reduced motility), which decreases the chance of reaching an egg cell. 

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Harriet Marsden is a writer for The Week, mostly covering UK and global news and politics. Before joining the site, she was a freelance journalist for seven years, specialising in social affairs, gender equality and culture. She worked for The Guardian, The Times and The Independent, and regularly contributed articles to The Sunday Times, The Telegraph, The New Statesman, Tortoise Media and Metro, as well as appearing on BBC Radio London, Times Radio and “Woman’s Hour”. She has a master’s in international journalism from City University, London, and was awarded the "journalist-at-large" fellowship by the Local Trust charity in 2021.