HumanityReport.com

300,000 Years of Homo Sapiens

A journey through human population — from scattered tribes in Africa to 8 billion people.

Press play to begin
?
After animation: drag chart to explore different time periods
Catastrophes
Technology
Milestones
Civilization
300k
Years of History
8.1B
Humans in 2025
~117B
Humans Ever Lived
~10B
Projected Peak
97% of all population growth happened in the last 0.07% of human history
7 of 8 billion people alive today were added in just the last 225 years
6.5% of all humans who ever lived are alive right now

The Malthusian Question

Was the 18th-century economist right all along — just early?

"Population, when unchecked, increases in a geometrical ratio. Subsistence increases only in an arithmetical ratio."
— Thomas Robert Malthus, An Essay on the Principle of Population, 1798

The Original Thesis: In 1798, Malthus argued that human population grows exponentially while food production grows linearly. Without "checks" — famine, disease, war, or voluntary restraint — population would inevitably outstrip resources, leading to widespread misery.

Why He Seemed Wrong: The Industrial Revolution, Green Revolution, and fossil fuels temporarily broke the trap. We produced more food faster than population grew. For 200 years, optimists declared Malthus debunked.

Why He May Be Right: Those productivity gains came from one-time sources: fossil fuels (depleting), aquifers (draining), topsoil (eroding), and biodiversity (collapsing). We didn't escape the trap — we borrowed against it. The bill is coming due.

The Modern Twist: Malthus predicted population would be checked by scarcity. What's actually happening is stranger: prosperity itself is the check. The richer societies become, the fewer children they have. We may decline not from having too little, but from wanting too little.

The Story So Far

Historical Checkpoints

300,000 BCE ~200k First Homo sapiens emerge in Africa
70,000 BCE ~800k Toba catastrophe — possible genetic bottleneck
10,000 BCE ~6M Agricultural Revolution begins
1 CE ~190M Roman Empire at peak
1350 CE ~370M Black Death kills 30-60% of Europe
1804 1B First billion — 300,000 years to get here
1927 2B 123 years to double
1975 4B 48 years to double again
2022 8B 47 years — the doubling is slowing

What Caused the Explosion (1800–2000)

Germ Theory & Sanitation
Clean water, sewage systems, and understanding disease transmission slashed infant mortality from ~40% to under 1%
Vaccines & Antibiotics
Smallpox killed 300M+ in the 20th century alone before eradication. Penicillin made fatal infections survivable
The Green Revolution
High-yield crops, synthetic fertilizers, mechanization. Global cereal production tripled on only 10% more land
Fossil Fuels
Coal, oil, gas — 10,000x human muscle power. Every calorie of food now requires ~10 calories of fossil fuel[14]
Demographic Transition Lag
Death rates fell decades before birth rates adjusted. This gap caused the population explosion

The Uncomfortable Truths

The Fertility Collapse

Below Replacement: 110 of 204 Countries[33]
Global TFR has halved from 5.0 (1950) to 2.2 (2021)[33]. Most of humanity now lives in sub-replacement nations
The Extreme Cases
South Korea reached 0.72 in 2023[13] (0.75 in 2024 per Statistics Korea reports[13]). Several advanced economies remain near ~1.2. On current trajectories, many low-fertility societies face significant population decline by 2100[1].
No Country Has Reversed It[34]
Policy can slow or modestly lift fertility, but durable reversals from "lowest-low" levels are rare[34]. South Korea has spent roughly $200B over ~16 years on pro-natalist measures, yet fertility remained extremely low[15].
China's Collapse
Population began shrinking in 2022[12]. UN-based scenarios commonly cited put 2100 near ~770–800M (≈600M fewer vs ~1.4B)[12]. A widely cited estimate warns China's National Social Security Fund could be depleted around 2035[11].

The Biological Crisis

Sperm Count Collapse
Meta-analyses report a ~50–60% decline in sperm concentration/total sperm count since 1973 in North America/Europe/Australia[5], with an updated analysis finding the decline continues and may be accelerating globally[6].
Endocrine Disrupting Chemicals
Plasticizers, pesticides, PFAS — found in 99% of Americans[35]. Linked to 10-34% testosterone reduction[36]. Men's testosterone has declined ~1% per year since the 1970s
Microplastics Everywhere
Found in all 62 placentas tested[37], all 40 semen samples[39], blood, lungs. Heart patients with microplastics in arteries: 2× more likely to have heart attack/stroke[53]
The Unknowns
86,000+ chemicals registered[38]. ~500-1,000 new ones yearly. Most never tested for reproductive effects

The Economic Time Bomb

Inverted Age Pyramids[27]
China: 8 workers per retiree now → 2 workers per retiree by 2050[50]. Japan already at crisis. Who pays the pensions?
Old Before Rich[52]
France took 115 years to age. Sweden: 85 years. China: 36 years[52]. GDP per capita when China hit "aging society" (2000): just $959. Many countries aging out before building wealth to support their elderly
GDP = Workers × Productivity
China's potential growth may fall from 6%+ to ~2% by 2050s[50]. Permanent stagnation is possible
Innovation Requires People
Fewer scientists, inventors. Older populations are risk-averse. "Idea stagnation" looms
The Migration Wars
Every shrinking nation will compete for immigrants. Sub-Saharan Africa becomes center of gravity

The Psychological Collapse

Children Became Unaffordable[28]
Cost to raise a child in China: 6.3× GDP per capita ($74,800 to age 17). US: $310k+ to age 18[29]. Housing, childcare, education — children are now luxury goods
Climate & Existential Anxiety[30]
39% of young people (16-25) say climate fears affect their decision to have children. "Why bring kids into a dying world?" is now mainstream
Social Atomization[31]
Rising singlehood, declining marriage, loneliness epidemic. Singles nearly twice as likely as married adults to report weekly loneliness (39% vs 22%)
Loss of Meaning[51]
Secularization, individualism, careerism. Nonreligious Americans: TFR below 1.5 vs ~2.0 for weekly religious attenders[51]. Children went from economic asset to economic liability

The Antibiotic Apocalypse

39 Million Deaths by 2050 (AMR)[10]
Lancet study: resistant infections will directly kill 39 million. Three deaths every minute
The Pipeline is Dry[44]
Fewer than 15 innovative antibiotics in development[44]. Big pharma abandoned antibiotic R&D — not profitable enough
Common Infections Becoming Lethal[45]
40%+ of E. coli now resistant to third-generation cephalosporins[45]. In Africa: 70%+. Returning to pre-penicillin era
Modern Medicine Collapses
C-sections, cancer chemo, transplants all require antibiotics. Without them, routine procedures become lethal

The Water & Soil Crisis

Half the World by 2025[43]
Two-thirds may face water stress[43]. Hundreds of millions at risk of displacement. Wars will be fought over rivers
Aquifers Running Dry[42]
Ogallala: 70% of Texas Panhandle unusable within 20 years[42]. Once depleted, takes 6,000 years to replenish naturally[42]. That's older than recorded history
60 Years of Topsoil Left[17]
90% at risk by 2050. Takes 1,000 years to create 3cm. Half already gone in 150 years
Food Production at Risk[26]
More than half of global food production at risk by 2050[26]. No soil + no water = no food

Ecosystem Collapse

2025: Worst Bee Losses Ever
Between April 2024–April 2025, a national U.S. beekeeping survey estimated 55.6% managed colony losses[8] (commercial operators in some reports: ~60%+[8]). Varroa mites and nutrition stress remain major drivers.
Insect Biomass Down ~75%[9]
Flying insects collapsed in recent decades. Foundation of food webs. 96% of songbirds need insects
Coral Reefs Gone by 2050[19]
Ocean 30% more acidic[40]. 500 million depend on reefs[41]. When they go, fish follow
The Sixth Extinction[18]
Species dying 1000x faster than natural rate. We're in a mass extinction event

The Nuclear Precipice

12,241 Warheads Still Exist[48]
~2,100 on high alert[48], ready in minutes. Russia and US hold 90%
New Arms Race[48]
China adding ~100 warheads/year (now 600+)[48]. Russia suspended New START[49]. No control regime for 2026+
Highest Risk Since Cold War
Doomsday Clock at 89 seconds — closest ever[7]. Multiple flashpoints active
AI + Nukes
AI integration raises miscalculation risks. Machines making extinction-level choices

The Next Pandemic

H5N1 Bird Flu Warning[21]
70+ human cases (2024-25), first US death. 167M+ birds affected. Experts urge "urgent action"
Few Mutations Away
H5N1 needs only a few changes to spread human-to-human. Each infection is a dice roll
We Didn't Learn
Vaccine hesitancy up, public health cut, surveillance fragmented. Production still too slow
Historical Mortality[47]
H5N1 historically killed ~52-60% of confirmed cases[47] (recent US cases: much lower with modern care). 1918 flu killed 50+ million[46]. "When" not "if"

The Feedback Loops

These crises don't exist in isolation. They amplify each other.

The AI Variable

What's Coming (2025–2035)

27-30% of Work Automatable by 2030[23]
AI could generate $2.9T in US value annually. 12-14% may need to change occupations entirely
White-Collar Jobs Hit First
Legal, financial, coding, customer service — AI performs at or above human level. 60% of admin automatable
40%+ Need Reskilling[25]
By 2030, nearly half the workforce needs new skills. "AI fluency" demand jumped 7x in two years
The Demographic Paradox
AI might solve the shrinking workforce. But if it does, the last economic argument for children disappears. The technology that could save us from demographic decline may accelerate it

The Longer Horizon (2035–2050+)

AGI Timeline Unknown
Estimates: 2030s to "never." If achieved, machines doing any cognitive task. Implications unknowable
50-80% of Jobs Transformed[24]
Goldman Sachs: 300 million displaced globally. Displacement may outpace job creation for decades
Physical Automation
Construction, logistics, agriculture — 40% of physical jobs at risk. Self-driving trucks, autonomous warehouses
The Decoupling
Labor's share of income may converge to zero. What happens to 8 billion who can't sell labor?

A Robot's View

The Prompt: "Analyse the content of humanityreport.com and this structured data. Your job is to read the information, understand what it means, then complete the JSON with an adequate input from you. Be super concise, don't hold anything back, don't try to please anyone. Be brutally honest."
Loading...
Data and claims are sourced. See References below.

© 2025 robertschmidt.dev & Claude Opus 4.5

References

Population & Demographics

  1. United Nations DESA. World Population Prospects 2024. population.un.org/wpp
  2. UNFPA. State of World Population 2025. unfpa.org/swp2025
  3. Sjödin, P. et al. (2012). Resequencing Data Provide No Evidence for a Human Bottleneck. Mol. Biol. Evol. 29(10):2843-50
  4. Council on Foreign Relations. China's Pension System (Jan 2025). cfr.org
  5. Scientific American. China's Population Could Shrink to Half by 2100 (May 2024). scientificamerican.com
  6. OECD. Korea's Unborn Future: Understanding Low-Fertility Trends (2025). oecd.org
  7. Asia Society. Paying for Birth: Is it Worth It? (2023). asiasociety.org
  8. GBD 2021 Fertility Collaborators. Global fertility in 204 countries and territories, 1950–2021. Lancet (2024). thelancet.com
  9. Thévenon, O. (2024). Can government policies reverse undesirable declines in fertility? IZA World of Labor. wol.iza.org
  10. AMRO Asia. Demography Presents Both Challenges and Opportunities for China. amro-asia.org

Biological & Reproductive

  1. Levine, H. et al. (2017). Temporal trends in sperm count: systematic review and meta-regression. Hum Reprod Update. 23(6):646-659. PubMed
  2. Levine, H. et al. (2023). Temporal trends in sperm count: updated meta-analysis. Hum Reprod Update. 29(2):157-176. PubMed
  3. Swan, S. (2021). Count Down: How Our Modern World Is Threatening Sperm Counts. Scribner. ISBN: 978-1982113667
  4. CDC/ATSDR. Fast Facts: PFAS in the U.S. Population (2024). atsdr.cdc.gov
  5. Meeker, J.D. et al. (2014). Reduced testosterone tied to endocrine-disrupting chemical exposure. J. Clin. Endocrinol. Metab. endocrine.org
  6. Garcia, M.A. et al. (2024). Microplastics in human placentas. University of New Mexico. PMC
  7. EPA. TSCA Chemical Substance Inventory (2025). epa.gov
  8. Zhao, Y. et al. (2024). Microplastics detected in human semen and testis. ScienceDirect
  9. Marfella, R. et al. (2024). Microplastics and Nanoplastics in Atheromas and Cardiovascular Events. N Engl J Med. 390:900-910. NEJM

Ecosystem & Environment

  1. Auburn University / Bee Informed Partnership. U.S. Beekeeping Survey 2024–2025 (Jun 2025). beeinformed.org
  2. Hallmann, C.A. et al. (2017). More than 75% decline over 27 years in flying insect biomass. PLoS ONE 12(10):e0185809. doi.org
  3. FAO. Status of the World's Soil Resources (2015). fao.org
  4. IPBES. Global Assessment Report on Biodiversity and Ecosystem Services (2019). ipbes.net
  5. Hoegh-Guldberg, O. et al. (2007). Coral Reefs Under Rapid Climate Change. Science 318(5857):1737-42
  6. Global Commission on the Economics of Water. Turning the Tide (2024). watercommission.org
  7. NOAA. Ocean Acidification. noaa.gov
  8. NOAA/UN. Value of Coral Reefs. reefresilience.org
  9. USGS. High Plains Water Level Monitoring Study (Ogallala Aquifer). usgs.gov
  10. UN/UNICEF. Water scarcity. unicef.org

Health & Pandemics

  1. WHO. Global call to action on antimicrobial resistance (Oct 2025). who.int
  2. Lancet. Global burden of bacterial antimicrobial resistance 1990–2021 (2024). doi.org
  3. CDC. H5N1 Bird Flu: Current Situation Summary (2025). cdc.gov
  4. WHO. Antibacterial products in clinical development (2024). who.int
  5. WHO GLASS. Global Antimicrobial Resistance Surveillance (2025). who.int
  6. National Archives. The Influenza Epidemic of 1918. archives.gov
  7. WHO. Human mortality from H5N1. Wikipedia

Nuclear & Existential Risk

  1. Bulletin of the Atomic Scientists. 2025 Doomsday Clock Statement (Jan 2025). thebulletin.org
  2. SIPRI. SIPRI Yearbook 2024: Armaments, Disarmament and International Security. sipri.org
  3. SIPRI. SIPRI Yearbook 2025: Nuclear risks grow as new arms race looms. sipri.org
  4. Arms Control Association. Russia Suspends New START (Mar 2023). armscontrol.org

Economics & AI

  1. Pimentel, D. & Pimentel, M. (2003). Sustainability of meat-based and plant-based diets and the environment. Am J Clin Nutr. 78(3):660S-663S
  2. McKinsey Global Institute. The economic potential of generative AI (Jun 2023). mckinsey.com
  3. Goldman Sachs. The Potentially Large Effects of AI on Economic Growth (Mar 2023). goldmansachs.com
  4. World Economic Forum. Future of Jobs Report 2023. weforum.org
  5. OECD. Working Better with Age: Japan (2018). doi.org
  6. Oxford Economics. China's output growth could drop by half (2025). Fortune

Psychology & Society

  1. YuWa Population Research Institute. Cost of Childbearing in China Report (Feb 2024). Via: CNN
  2. Brookings Institution. Estimated Expenditures of Raising a Child (Aug 2022). brookings.edu
  3. Hickman, C. et al. (2021). Climate anxiety in children and young people: global survey. Lancet Planet Health. 5(12):e863-e873. doi.org
  4. American Psychiatric Association. Healthy Minds Poll: Loneliness in America (Jan 2024). psychiatry.org
  5. U.S. Surgeon General. Our Epidemic of Loneliness and Isolation (May 2023). hhs.gov
  6. Stone, L. (2024). America's Growing Religious-Secular Fertility Divide. Institute for Family Studies. ifstudies.org