Chemicals and Heat Stress Accelerate Fertility Drop
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- Susanne Brander led a review of 177 studies linking endocrine‑disrupting chemicals and climate‑related heat stress to fertility loss.
- Shanna Swan co‑authored the paper; her 2017 study documented a >50% drop in sperm counts among Western men over four decades.
- University of Washington’s Institute for Health Metrics and Evaluation warned that by 2050 more than three‑quarters of nations will fall below replacement‑level fertility.
- Phthalates have been tied to altered sperm morphology in invertebrates, impaired spermatogenesis in rodents, and reduced sperm counts in humans.
- Heat stress disrupts hormone production in humans and skews sex ratios in temperature‑dependent species such as fish and reptiles.
Why it matters: Governments will face shrinking workforces as fertility falls, with >75% of nations below replacement by 2050, driving higher social‑security costs and straining public health systems.
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