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Penises are shrinking and genitals becoming malformed because of pollution, an environmental scientist has warned in a new book detailing the challenges facing human reproduction. Dr Shanna Swan writes that humanity is facing an “existential crisis” in fertility rates as a result of phthalates, a chemical used when manufacturing plastics that impacts the hormone endocrine. As a result of this pollution, a growing number of babies are being born with small penises, Dr Swan writes.