Falling sperm counts 'threaten human survival', expert warns

Epidemiologist Shanna Swan says low counts and changes to sexual development could endanger human species

Falling sperm counts and changes to sexual development are threatening human survival" and leading to a fertility crisis, a leading epidemiologist has warned.

Writing in a new book, Shanna Swan, an environmental and reproductive epidemiologist at Icahn School of Medicine at Mount Sinai in New York, warns that the impending fertility crisis poses a global threat comparable to that of the climate crisis.

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