In the United States, nearly 1 in 8 couples struggles with infertility. Unfortunately, physicians like me who specialize in reproductive medicine are unable to determine the cause of male infertility around 30 percent to 50 percent of the time. There is almost nothing more disheartening than telling a couple “I don’t know” or “There’s nothing I can do to help.” Upon getting this news, couple after couple asks me questions that all follow a similar line of thinking. “What about his work, his cellphone, our laptops, all these plastics? Do you think they could have contributed to this?” What my patients are really asking me is a big question in male reproductive health: Does environmental toxicity contribute to male infertility? Male Fertility Decline Infertility is defined as a couple’s inability to get pregnant for one year despite regular intercourse. When this is the case, doctors evaluate both partners to determine …