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A public health emergency

The Silent Crisis

Global sperm counts have halved in under 50 years. The decline is accelerating.

The Evidence at a Glance

Data drawn from meta-analyses of hundreds of studies spanning five decades clearly shows a rapid decline in male fertility. The leading experts are sounding the alarm about this silent crisis that could signal the end of binary reproduction. The world needs to wake up and recognise the danger we are in unless we start taking action today.

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About Us

We are a supporter funded organisation dedicated to spreading awareness about the catastrophic risks posed by accelerated infertility. Current news is dominated by war and violence, yet it is masking a massive threat that could wipe humanity out. We provide real facts from the experts and a growing resource for finding advice and support.

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51.6%
Decline in global sperm concentration between 1973 and 2018
Levine et al., Human Reproduction Update (2023)
2.64%
Annual decline rate post-2000 — double the 1.16% rate pre-2000
Levine et al., Human Reproduction Update (2023)
~49M/mL
Current average sperm concentration, down from ~99M/mL in 1973
Levine et al., 2017 & 2023 meta-analyses (2023)
15M/mL
WHO threshold for "normal" sperm concentration
WHO Laboratory Manual, 6th Edition (2021)

What's Killing Sperm?

From molecular biology to modern life — the overlapping factors are creating a collapse in all 3 indicators of sperm health.

The Three Threats to
Sperm Survival
Every ejaculation releases millions of sperm. Very few will survive. These are the three factors that determine which live — and which die.
Threat 01 — Morphology
A Blunt Head Cannot Penetrate
A healthy sperm has a smooth, oval head — shaped to pierce the egg's outer layer. Exposure to toxins, heat, and oxidative stress deforms the head, blunting it into a shape that bounces off on contact. The sperm is alive, swimming, but functionally dead — it will never fertilise.
Threat 02 — Motility
The Tail Stops Beating
The tail's rhythmic whip drives the sperm forward through hostile terrain. Stress hormones, chemical exposure, and inflammation slowly paralyse it. Without progressive motility, the sperm drifts aimlessly and dies before reaching the egg.
Threat 03 — Sperm Count
Strength in Numbers, Lost
Fertilisation is a numbers game — millions are needed for one to succeed. Global sperm counts have fallen 51.6% since 1973 and the decline is accelerating. When count drops below critical thresholds, natural conception becomes statistically improbable.

Latest Analysis

Commentary and deeper dives into the research.

Why This Matters

Sperm count is not merely a measure of fertility — research links it to broader indicators of male health, including cardiovascular risk, metabolic disease, and overall mortality. The decline is a canary in the coal mine for environmental and public health.

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Global Map

Featured Research

Key studies and reports driving our understanding of male reproductive decline.

Temporal trends in sperm count: a systematic review and meta-regression analysis (2023 update) — Human Reproduction Update 1 Mar 2023 Temporal trends in sperm count: a systematic review and meta-regression analysis (2017) — Human Reproduction Update 1 Nov 2017 Sperm concentration remains stable among fertile American men (2025) — Fertility and Sterility 1 Jan 2025 Potential effects of environmental toxicants on sperm quality (2025) — Frontiers in Endocrinology 24 Mar 2025 Toxic effects of PFAS on sperm: epidemiological and experimental evidence — Frontiers in Endocrinology 1 Mar 2023