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In “Count Down,” Shanna Swan tells a story of declining sperm count, rising infertility and the possible extinction of the human species.

Scientists are witnessing an alarming trend: Men’s sperm counts are down, testosterone levels have plunged and erectile dysfunction is increasing. Male infertility is on the rise — and exposure to synthetic chemicals known as phthalates could be to blame, according to fertility scientist Shanna Swan, Ph.D., author of the new book, “Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development and Imperiling the Future of the Human Race.” Citing Swan’s book, the New York Post reported that the global fertility rate has dropped 5...

Chemicals pervasive in our world are interfering with the hormones in our bodies and our reproductive health, epidemiologist Shanna Swan argues.

An epidemiologist has warned that falling sperm counts are a threat to human survival and has done a study to back up the claim. Dr. Shanna Swan&md...

"This is a big problem."