July 21, 2024

Recent research has suggested a global reproductive crisis may be looming, with researchers in Israel saying average sperm counts may have more than halved in the past 40 years. But a study published last month appears to cast doubt on this narrative. Ian Sample is joined by the Guardian’s science correspondent Nicola Davis to find out why these studies have come to different conclusions – and what could be causing the crisis if the declines are as dramatic as they seem

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