Latest analysis has steered a worldwide reproductive disaster may very well be within the offing, with researchers in Israel saying common sperm counts could have greater than halved prior to now 40 years. However a examine revealed final month seems to name this narrative into query. Ian Pattern is joined by the Guardian’s science correspondent Nicola Davis to unpick why these research have come to totally different conclusions – and what may very well be inflicting the disaster, if declines are as dramatic as they seem
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