Billionaire's WARNING: I'm SELLING. The Crash Is Already Here!
A billionaire who called the dot-com crash says the AI bubble is the biggest in US history and sperm counts could hit zero by 2045 — and Wall Street will never warn you about either.
The Diary Of A CEO with Steven Bartlett
Billionaire's WARNING: I'm SELLING. The Crash Is Already Here!
A billionaire who called the dot-com crash says the AI bubble is the biggest in US history and sperm counts could hit zero by 2045 — and Wall Street will never warn you about either.
TL;DR
Legendary investor Jeremy Grantham — who has managed $165 billion and predicted the dot-com crash and the 2008 housing collapse — argues we are now in the biggest investment bubble in American history, centred on AI [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 . He urges investors to dump US stocks, avoid crypto, and shift to non-US equities, bonds, and precious metals [2] — Jeremy Grantham "Human sperm counts have plummeted from 180 million to 35 million units per milliliter since hunter-gatherer times, with the decline acceler…" 1:09:35 . The conversation expands into a sobering discussion of declining global sperm counts driven by pesticides and plastics, runaway wealth inequality, and the erosion of the social contract. Key takeaway: get diversified out of US markets now, because major institutions will never warn you to [3] — Jeremy Grantham "You will not receive the advice from investment advisors to get your tail out of the market, ever. It is not good business for them to do t…" 20:45 .
Billionaire investor Jeremy Grantham warns that the AI bubble is the biggest in American history, explains his investment strategy for protecting wealth, discusses declining sperm counts caused by environmental toxins, and examines widening wealth inequality and societal decline.
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Steven Bartlett introduces Flightcast, then teases the episode with Grantham's most provocative claims: sell US stocks, avoid crypto, Bitcoin will go to zero, and SpaceX is a 'fabulous BS story'.
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Bartlett introduces Grantham, who describes his investing philosophy: a longer time horizon, higher abstraction, and a focus on what people are missing — especially humanity's dangerous short-term optimism.
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Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
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Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
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Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
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Grantham confirms he is generally referred to as a billionaire but has donated 90-95% of his personal fortune to the Grantham Foundation for the Protection of the Environment.
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A 70% decline in the most overpriced AI stocks would not be unexpected [1] — Jeremy Grantham "70% decline not unexpected: Grantham says the most overpriced AI stocks could fall 70% from current levels, noting the NASDAQ fell 82% duri…" 10:32 ; the NASDAQ fell 82% in 2000. Japan's bubble peaked at 65x earnings in 1989 and took 35 years to recover — a potential template for the US.
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Diversify with bonds, cash, precious metals. Property is fine but expensive. The detailed portfolio: 60% non-US equities, 5-10% precious metals, some real estate, rest in bonds [1] — Jeremy Grantham "Diversify into non-US equities, hold bonds, keep some cash, and put 5-10% in precious metals. Property is fine but overpriced. Zero crypto.…" 13:55 . Explains how bonds work and where to buy them.
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Foreign stocks — emerging markets, Europe, Japan — have outperformed the US by 40 percentage points in the last 12 months. Grantham is not confident US equities will be intact in 5-10 years; the 2000-2010 decade delivered negative returns.
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Wall Street has never told clients to exit the market — not in 1929, 1972, or 2000 — because it's career suicide [1] — Jeremy Grantham "At a 1998 investment conference, 99% of 400 professional analysts privately agreed the overpriced market would crash — guaranteeing a major…" 22:36 . In 1998, 99% of analysts privately agreed a crash was coming but their employers said the opposite. GMO lost half its business for being honest.
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Founders should lock up capital now, build conservatism into the business, and prepare for a potential collapse in venture funding. The sun is shining — act as if a storm is coming.
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Stock prices are driven by psychology and momentum — what you think the next buyer will pay — not by fundamental earnings streams. The efficient market hypothesis is complete nonsense.
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Grantham and Bartlett explore Geoffrey Hinton's warning that a higher intelligence is historically never sustainably benevolent to a lower one — the only exception being mothers to babies. Building benevolence into AI may be our only hope.
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The paperclip thought experiment: a literally-minded AI instructed to maximise paperclip production could destroy the planet. Any sloppy open-ended instruction to a superintelligence risks catastrophic unintended consequences.
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Apple, Google, Meta, Amazon, Microsoft, Tesla, and Nvidia once held separate near-monopolies. Now they're all fighting in the same AI arena with $200 billion+ annual CapEx budgets — and only one can win [1] — Jeremy Grantham "Apple, Google, Microsoft, Meta, Amazon, Tesla, Nvidia each had near-monopolies in their own space. Now they're all pouring hundreds of bill…" 37:50 .
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Sponsored segments for Stan Store's Stanley AI tool and Pipedrive CRM.
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Humanoid robots plus cheap AI intelligence are creating an explosion in hardware startups. Figure AI's robot outperformed a human at package sorting. The intelligence is now cheap — the hardware was always there.
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Grantham argues SpaceX will fail to deliver on its prospectus promises [1] — Jeremy Grantham "SpaceX is such a fabulous BS story. Mining asteroids. Huge, incredible success of AI. It's the classic description of a market peak. It's w…" 48:12 , comparing it to the South Sea Bubble. 90% of SpaceX's theoretical value is AI. Going to Mars is physiologically near-impossible for humans.
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Musk's success with Tesla came from talking the stock up to 5x real value, selling shares, building factories, and repeating. SpaceX requires the same trick — but the market cycle won't cooperate this time.
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Musk's success with Tesla came from talking the stock up to 5x real value, selling shares, building factories, and repeating. SpaceX requires the same trick — but the market cycle won't cooperate this time.
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Grantham advises young people to learn practical skills — engineering, farming, growing food — as civilisational complexity begins to unravel. The UK ambulance wait time rising from 12.5 minutes to 90 minutes is a warning sign.
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The US Gini ratio is now comparable to Brazil and Mexico. Since 1975, all meaningful economic gains have gone to the top 10%. Voter anger — kick the rascals out — is universal across Western democracies.
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Historical macro studies show extreme inequality is only reset by civil collapse, mass warfare, or revolution [1] — Jeremy Grantham "The US Gini ratio is now comparable to Brazil and Mexico. Since 1975, nearly all economic gains have gone to the top 10%. History shows ext…" 54:50 . The 1940s reset was 'lucky' — World War II equalised society through shared sacrifice.
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Grantham calls for a steeper progressive tax curve — not revolutionary, but returning to the 1935-1975 model where the bottom quarter earned slightly more than average and the top slightly less each year.
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The full portfolio recommendation: 60% non-US broad equity index, 5-10% precious metals, real estate if sensible, rest in bonds. Emerging markets up 65% in 12 months vs S&P's 25%.
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Grantham owns zero crypto, has never owned any, and will never advise anyone to buy it. Bitcoin will certainly go to zero eventually. Property is fine as an asset but overpriced; population decline threatens future demand.
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Grantham owns zero crypto, has never owned any, and will never advise anyone to buy it. Bitcoin will certainly go to zero eventually. Property is fine as an asset but overpriced; population decline threatens future demand.
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Grantham owns zero crypto, has never owned any, and will never advise anyone to buy it. Bitcoin will certainly go to zero eventually. Property is fine as an asset but overpriced; population decline threatens future demand.
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Sponsored segments for HeyGen AI video translation and The Diary of a CEO 1% Diary product.
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Grantham's environmental foundation led him to the catastrophic decline in insects (50-75% biomass loss) and then to declining human sperm counts. Shanna Swan's 2011 report showed sperm counts had almost halved since 1970.
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Sperm counts have fallen from 180M to 35M units/ml; 17% of couples now need fertility help (up from near zero 15-20 years ago) [1] — Jeremy Grantham "Sperm count: 180M → 35M units/ml: Human sperm count has fallen from an estimated 180 million units per milliliter in hunter-gatherer times …" 1:11:51 . In 20-25 years the average couple will need medical assistance to conceive. Dr. Swan projects median count hits zero by 2045.
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Plastics leach endocrine-disrupting toxins. Phthalates lower testosterone in male fetuses during the first trimester. BPA floods the body with synthetic estrogen. PFAS forever chemicals accumulate in blood. Microplastics found in 100% of human testicular tissue in 2024 [1] — Jeremy Grantham "EU banned 1,500 cosmetic chemicals; US banned 12: The EU has banned 1,500 chemicals from cosmetics, Canada has banned 550, while the US FDA…" 1:21:22 .
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Harvard and Mass General studies showed men eating the fewest pesticide foods had double the sperm count [1] — Jeremy Grantham "A Harvard and Mass General Hospital study showed men eating the fewest pesticide-heavy foods had double the sperm count of those eating the…" 1:17:48 ; women had 68% vs 38% live birth rates. Berries, apples, spinach are worst; bananas, melons, oranges safest. The fetus is 100-1,000x more vulnerable than adults.
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App recommendations: Yuka, EWG Healthy Living, Think Dirty, ClearYa. Bartlett recommends using AI to photograph and scan ingredient labels. Grantham envisions a 'green Amazon' guaranteeing toxin-free products.
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The US permits 85 banned-in-EU pesticides, sprays 300M lbs/year of chemicals banned in Europe, allows banned food additives like potassium bromate, and has only banned 12 cosmetic chemicals vs EU's 1,500 [1] — Jeremy Grantham "The EU has banned 1,500 chemicals from cosmetics. Canada has banned 550. The US has banned 12. This regulatory gap directly contributes to …" 1:21:22 . 45% of US tap water contains PFAS.
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2.1 children per couple is the replacement rate — a commons like clean air. Nothing across 200 policy experiments has permanently raised birth rates. Society must be restructured to make family-raising the collective priority [1] — Jeremy Grantham "2.1 children per couple is the replacement rate for a stable population. Like clean air or clean water, it's a commons — but nothing tried …" 1:27:15 .
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For everyday workers, the message is simple: plan as if times will not be easy. Build cash reserves, develop useful mechanical or scientific skills, and make strong community connections.
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For everyday workers, the message is simple: plan as if times will not be easy. Build cash reserves, develop useful mechanical or scientific skills, and make strong community connections.
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Grantham cites maternal mortality as the single best measure of civilisation. US: 21/100,000 — 50% worse than the second-worst developed nation; Norway: near zero. Denmark, Japan, France, Germany are better places to live in the things that actually matter.
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Grantham's impossible goal: write a book about toxicity and social contract that pulls a 'Silent Spring' — one that shifts political will and makes family-nurturing environments a civilisational priority. Book plug and farewell.
- AUM (Assets Under Management)
- The total market value of investments a financial institution manages on behalf of its clients.
- Bull market
- A period of sustained rising prices in financial markets, typically accompanied by investor optimism and economic growth.
- Bear market
- A period of sustained falling prices in financial markets, often defined as a decline of 20% or more from recent highs.
- P/E ratio (Price-to-Earnings)
- A stock valuation metric that divides a company's share price by its earnings per share; higher ratios indicate investors expect future growth.
- Index fund
- A passive investment fund that tracks a market index (e.g., S&P 500) rather than being actively managed, typically offering low fees and broad diversification.
- Value stock
- A share of a company trading at a price lower than its apparent intrinsic value, typically characterised by low P/E ratios.
- Small cap
- Companies with a relatively small market capitalisation, typically under $2 billion; often higher-growth but more volatile investments.
- Endocrine disruptors
- Chemicals that interfere with the body's hormone system, potentially causing developmental, reproductive, and neurological problems.
- Phthalates
- A group of chemicals used to make plastics more flexible, widely found in cosmetics, food packaging, and personal care products; linked to hormone disruption.
- BPA (Bisphenol A)
- A synthetic estrogen-mimicking chemical used to harden plastics and line food cans; linked to reproductive harm and hormonal disruption.
- PFAS (Per- and Polyfluoroalkyl Substances)
- 'Forever chemicals' that do not break down in nature, used in non-stick cookware and waterproof materials; linked to cancer and reproductive harm.
- Gini ratio
- A statistical measure of income or wealth inequality within a population, ranging from 0 (perfect equality) to 1 (maximum inequality).
- Permabear
- An investor who persistently holds a pessimistic or bearish outlook on markets, often warning of overvaluation and impending downturns.
- CapEx (Capital Expenditure)
- Money a company spends to acquire or maintain long-term physical assets like factories, data centres, or equipment.
- Momentum (investing)
- The tendency for rising assets to keep rising as buyers are attracted by recent price gains, a behavioural pattern that fuels bubbles.
- Coupon (bond)
- The fixed annual interest rate a bond pays to its holder, expressed as a percentage of the bond's face value.
- Atrazine
- The second most widely used herbicide in the US, sprayed on corn and sugarcane; linked in peer-reviewed studies to chemical castration in frogs and reproductive harm in humans.
- Tragedy of the commons
- An economic concept describing how shared resources are depleted when individuals act in self-interest, used here to argue children are a 'common good' societies must protect.
- Magnificent 7 (Mag 7)
- The seven largest US technology companies by market capitalisation: Apple, Microsoft, Nvidia, Amazon, Alphabet, Meta, and Tesla.
- Motility (sperm)
- The ability of sperm to move efficiently toward an egg; declining motility, alongside declining count, is a key driver of male infertility.
Chapter 1 · 00:00
Who Is Jeremy Grantham?
Steven Bartlett introduces Flightcast, then teases the episode with Grantham's most provocative claims: sell US stocks, avoid crypto, Bitcoin will go to zero, and SpaceX is a 'fabulous BS story'.
Chapter 2 · 02:34
Will AI Become The Next Financial Bubble?
Bartlett introduces Grantham, who describes his investing philosophy: a longer time horizon, higher abstraction, and a focus on what people are missing — especially humanity's dangerous short-term optimism.
Claims made here
Amazon fell 92% during the dot-com crash despite having risen 6-7 times before the peak.
The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a genuinely great idea attracts so much money that overvaluation becomes extreme, and the bigger the idea, the bigger the bust.
Despite going up 6-7 times before the crash, Amazon fell 92% during the tech bubble collapse before eventually inheriting the retail world.
Chapter 3 · 06:38
How Jeremy Grantham Built An Investing Empire
Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
Claims made here
The current US AI-driven stock market is the biggest investment bubble in American history, larger than the dot-com bubble of 2000.
Jeremy Grantham says the current AI-driven market is the biggest investment bubble in American history, surpassing the dot-com boom and the 1989 Japanese market peak.
SpaceX defines its addressable market as a quarter of global GDP and talks about mining asteroids. These are exactly the kinds of extraordinary claims that define market peaks. In 50-100 years, people will tell stories about SpaceX's prospectus the way they tell stories about the South Sea Bubble.
Chapter 5 · 08:09
Are You A Billionaire?
Grantham argues AI is a genuinely transformative idea that has produced the largest bubble in US history [1] — Jeremy Grantham "The AI investment bubble is the biggest in American history. Every major bubble — railroads, the internet — follows the same pattern: a gen…" 04:55 , comparing it to railroads and the internet — both of which collapsed dramatically before changing the world. Amazon fell 92% in the dot-com crash.
Jeremy Grantham's firm GMO managed up to $165 billion in assets at its peak, making it one of the largest institutional investment firms by AUM.
Chapter 6 · 08:58
What Happens When The AI Bubble Bursts?
Grantham confirms he is generally referred to as a billionaire but has donated 90-95% of his personal fortune to the Grantham Foundation for the Protection of the Environment.
Claims made here
The Japanese stock market peaked in 1989 at 65 times earnings and took 35 years to fully recover.
Jeremy Grantham has donated 90-95% of the over $1 billion he personally made to the Grantham Foundation for the Protection of the Environment, focused on green technology.
Grantham says the most overpriced AI stocks could fall 70% from current levels, noting the NASDAQ fell 82% during the 2000 tech bubble.
Chapter 7 · 11:15
How AI Will Change Everyday Life
A 70% decline in the most overpriced AI stocks would not be unexpected [1] — Jeremy Grantham "70% decline not unexpected: Grantham says the most overpriced AI stocks could fall 70% from current levels, noting the NASDAQ fell 82% duri…" 10:32 ; the NASDAQ fell 82% in 2000. Japan's bubble peaked at 65x earnings in 1989 and took 35 years to recover — a potential template for the US.
Japan's stock market peaked in 1989 at 65 times earnings and took 35 years to recover, serving as a warning for the overpriced US market today.
Chapter 8 · 12:33
The Investing Strategy For Right Now
Diversify with bonds, cash, precious metals. Property is fine but expensive. The detailed portfolio: 60% non-US equities, 5-10% precious metals, some real estate, rest in bonds [1] — Jeremy Grantham "Diversify into non-US equities, hold bonds, keep some cash, and put 5-10% in precious metals. Property is fine but overpriced. Zero crypto.…" 13:55 . Explains how bonds work and where to buy them.
Claims made here
UK house prices rose from 3.4 times annual family income in 1994 to over 10 times today.
Diversify into non-US equities, hold bonds, keep some cash, and put 5-10% in precious metals. Property is fine but overpriced. Zero crypto. If you hold US tech stocks, sell them. Grantham lost half his book of business for telling clients this in 1998 — but history proved him right.
UK house prices rose from 3.4 times annual family income in 1994 to over 10 times today, pricing young couples out of homeownership entirely.
Chapter 9 · 17:52
Why You Should Avoid US Stocks
Foreign stocks — emerging markets, Europe, Japan — have outperformed the US by 40 percentage points in the last 12 months. Grantham is not confident US equities will be intact in 5-10 years; the 2000-2010 decade delivered negative returns.
The exact strategy: 60% in non-US broad index funds, 5-10% precious metals, some real estate, the rest in bonds. Zero US stocks, zero crypto. Non-US equities have outperformed the S&P 500 by 40 percentage points in the last 12 months — and Grantham doesn't trust US equities to remain intact in 5-10 years.
Chapter 10 · 19:54
Why Investment Advisors Mislead Clients
Wall Street has never told clients to exit the market — not in 1929, 1972, or 2000 — because it's career suicide [1] — Jeremy Grantham "At a 1998 investment conference, 99% of 400 professional analysts privately agreed the overpriced market would crash — guaranteeing a major…" 22:36 . In 1998, 99% of analysts privately agreed a crash was coming but their employers said the opposite. GMO lost half its business for being honest.
Claims made here
From 2000 to 2010, US equity investors lost money — they had less money after 10 years than they started with.
At a 1998 investment conference, 99% of 400 professional analysts privately agreed the overpriced market would crash — guaranteeing a major bear market. Yet their employers were on stage telling clients everything was fine. This conflict of interest hasn't changed and never will.
Chapter 12 · 28:22
The Real Risks Of AI
Stock prices are driven by psychology and momentum — what you think the next buyer will pay — not by fundamental earnings streams. The efficient market hypothesis is complete nonsense.
Chapter 15 · 35:44
The Battle Between The Magnificent 7
Apple, Google, Meta, Amazon, Microsoft, Tesla, and Nvidia once held separate near-monopolies. Now they're all fighting in the same AI arena with $200 billion+ annual CapEx budgets — and only one can win [1] — Jeremy Grantham "Apple, Google, Microsoft, Meta, Amazon, Tesla, Nvidia each had near-monopolies in their own space. Now they're all pouring hundreds of bill…" 37:50 .
Apple, Google, Microsoft, Meta, Amazon, Tesla, Nvidia each had near-monopolies in their own space. Now they're all pouring hundreds of billions into the same AI battle with no guaranteed winner. The shift from 7 separate monopolies to 7 brutal competitors is one of the most dramatic reversals in corporate history.
Chapter 18 · 43:41
Will SpaceX Eventually Fail?
Grantham argues SpaceX will fail to deliver on its prospectus promises [1] — Jeremy Grantham "SpaceX is such a fabulous BS story. Mining asteroids. Huge, incredible success of AI. It's the classic description of a market peak. It's w…" 48:12 , comparing it to the South Sea Bubble. 90% of SpaceX's theoretical value is AI. Going to Mars is physiologically near-impossible for humans.
Chapter 22 · 53:25
What History Says About Wealth Inequality
The US Gini ratio is now comparable to Brazil and Mexico. Since 1975, all meaningful economic gains have gone to the top 10%. Voter anger — kick the rascals out — is universal across Western democracies.
Claims made here
The richest 1% of Americans control 31% of the nation's wealth while the bottom 50% share just 2.5%.
The richest 1% of Americans control 31% of the nation's entire wealth, while the bottom 50% of the population shares just 2.5% — a level of inequality comparable to Brazil and Mexico.
The US Gini ratio is now comparable to Brazil and Mexico. Since 1975, nearly all economic gains have gone to the top 10%. History shows extreme wealth inequality has only ever been reset by three catalysts: civil collapse, mass mobilisation warfare, or revolution. There is no documented peaceful fix.
Chapter 24 · 57:21
How To Build Wealth In Your 30s Today
Grantham calls for a steeper progressive tax curve — not revolutionary, but returning to the 1935-1975 model where the bottom quarter earned slightly more than average and the top slightly less each year.
Despite predicting the AI bubble will burst, Grantham's advice for wealth creation at 33 is simple: get deep into AI, know more than everyone else in the room, join a leading firm, and take big risks. Ride the wave while it's coming in — even if you know it will eventually crash.
Chapter 25 · 59:31
How To Invest Your Salary Wisely
The full portfolio recommendation: 60% non-US broad equity index, 5-10% precious metals, real estate if sensible, rest in bonds. Emerging markets up 65% in 12 months vs S&P's 25%.
Over the last 12 months, emerging markets have risen 65% while the S&P 500 is up only 25%, supporting Grantham's case for investing outside the US.
Chapter 29 · 1:04:37
Ads
Sponsored segments for HeyGen AI video translation and The Diary of a CEO 1% Diary product.
Claims made here
Flying insect biomass has declined by 50-75% over the last 60-70 years.
The biomass of flying insects has dropped by 50-75% over the last 60-70 years, a collapse that ecologist E.O. Wilson argued could eventually lead to the failure of nature itself.
Chapter 30 · 1:06:50
What's Really Causing The Baby Bust?
Grantham's environmental foundation led him to the catastrophic decline in insects (50-75% biomass loss) and then to declining human sperm counts. Shanna Swan's 2011 report showed sperm counts had almost halved since 1970.
Claims made here
Global sperm count has declined from approximately 100 million units/ml in 1970 to 35 million today, with the decline accelerating at 2.5% per year.
Human sperm counts have plummeted from 180 million to 35 million units per milliliter since hunter-gatherer times, with the decline accelerating at 2.5% per year. In 20-25 years, the average couple will need medical help to conceive. This is tomorrow — not some distant future problem.
Chapter 31 · 1:10:50
When Could Sperm Counts Reach Zero?
Sperm counts have fallen from 180M to 35M units/ml; 17% of couples now need fertility help (up from near zero 15-20 years ago) [1] — Jeremy Grantham "Sperm count: 180M → 35M units/ml: Human sperm count has fallen from an estimated 180 million units per milliliter in hunter-gatherer times …" 1:11:51 . In 20-25 years the average couple will need medical assistance to conceive. Dr. Swan projects median count hits zero by 2045.
Claims made here
The World Health Organization estimates that approximately 17% of young couples currently need some help getting pregnant.
Dr. Shanna Swan's projection indicates the median male sperm count is on track to hit zero by 2045 if current trends continue.
Human sperm count has fallen from an estimated 180 million units per milliliter in hunter-gatherer times to just 35 million today, with the rate of decline accelerating at 2.5% per year.
The World Health Organization estimates that 17% of young couples currently need help getting pregnant, up from near zero 15-20 years ago when average sperm counts were still above the 45 million threshold.
Dr. Shanna Swan's projections indicate that if current decline rates continue, the median male sperm count will reach zero by 2045, meaning the average couple will need medical help to conceive.
Chapter 33 · 1:16:04
How Pesticides Impact Fertility
Harvard and Mass General studies showed men eating the fewest pesticide foods had double the sperm count [1] — Jeremy Grantham "A Harvard and Mass General Hospital study showed men eating the fewest pesticide-heavy foods had double the sperm count of those eating the…" 1:17:48 ; women had 68% vs 38% live birth rates. Berries, apples, spinach are worst; bananas, melons, oranges safest. The fetus is 100-1,000x more vulnerable than adults.
Claims made here
A Harvard and Mass General Hospital study of 180 men found that those eating the fewest pesticide-contaminated foods had double the sperm count of those eating the most contaminated diet.
In a follow-up Harvard study of women, those with the cleanest diets had a 68% live birth rate versus 38% for those in the worst dietary quartile.
In Japan, the population of 20-year-olds today is only 50% of what it was in 1948, driven by sustained demographic decline.
A Harvard and Mass General Hospital study showed men eating the fewest pesticide-heavy foods had double the sperm count of those eating the most. Women with the cleanest diets had a 68% live birth rate versus 38% in the dirtiest quartile. Pesticides are literally on your food — and they're designed to kill our biological cousins.
A Harvard and Mass General Hospital study of 180 men found that those eating the fewest pesticide-heavy foods had double the sperm count of those eating the most contaminated foods.
A fetus is estimated to be 100 to 1,000 times more vulnerable to toxic chemicals than an adult, meaning maternal exposure to pesticides or plastics has a disproportionate impact on unborn children.
Japan's population of 20-year-olds is now 50% of what it was in 1948 — a demographic collapse driven by declining birth rates that Grantham says illustrates the economic danger of a baby bust.
Chapter 34 · 1:21:05
How To Reduce Toxic Chemical Exposure
App recommendations: Yuka, EWG Healthy Living, Think Dirty, ClearYa. Bartlett recommends using AI to photograph and scan ingredient labels. Grantham envisions a 'green Amazon' guaranteeing toxin-free products.
Claims made here
The EU has banned 1,500 chemicals from cosmetics; Canada has banned 550; the US FDA has banned only 12.
The EU has banned 1,500 chemicals from cosmetics. Canada has banned 550. The US has banned 12. This regulatory gap directly contributes to the US having a life expectancy 6 years lower than Sweden — a gap that has tripled over 70 years and is still growing.
The EU has banned 1,500 chemicals from cosmetics, Canada has banned 550, while the US FDA has banned only 12, reflecting vastly different regulatory approaches to consumer safety.
Chapter 35 · 1:22:16
Why US Products Are More Toxic
The US permits 85 banned-in-EU pesticides, sprays 300M lbs/year of chemicals banned in Europe, allows banned food additives like potassium bromate, and has only banned 12 cosmetic chemicals vs EU's 1,500 [1] — Jeremy Grantham "The EU has banned 1,500 chemicals from cosmetics. Canada has banned 550. The US has banned 12. This regulatory gap directly contributes to …" 1:21:22 . 45% of US tap water contains PFAS.
Claims made here
The life expectancy gap between the US and Sweden has grown from 2 years to 6 years over the last 70 years.
A UC Berkeley peer-reviewed study found atrazine exposure at levels below the EPA's safe drinking water limit chemically castrated male frogs and turned 10% into fully functional females capable of laying eggs.
The US allows 85 agricultural pesticides that are completely banned in the EU, China, and Brazil.
A US Geological Survey found that at least 45% of all US tap water is contaminated with PFAS forever chemicals.
The life expectancy gap between the US and Sweden has grown from 2 years to 6 years over the last 70 years, which Grantham attributes to the US's more permissive approach to toxic chemicals.
A US Geological Survey found that at least 45% of all US tap water is contaminated with PFAS forever chemicals, which are directly linked to falling sperm counts and testicular cancer.
Chapter 36 · 1:26:52
How To Stay Healthy In A Toxic World
2.1 children per couple is the replacement rate — a commons like clean air. Nothing across 200 policy experiments has permanently raised birth rates. Society must be restructured to make family-raising the collective priority [1] — Jeremy Grantham "2.1 children per couple is the replacement rate for a stable population. Like clean air or clean water, it's a commons — but nothing tried …" 1:27:15 .
2.1 children per couple is the replacement rate for a stable population. Like clean air or clean water, it's a commons — but nothing tried across 200 policy experiments in any country has permanently raised birth rates. Capitalism's focus on financial achievement over community and child rearing is making the human species incompatible with itself.
Chapter 37 · 1:33:17
The Most Important Thing We Missed
For everyday workers, the message is simple: plan as if times will not be easy. Build cash reserves, develop useful mechanical or scientific skills, and make strong community connections.
Maternal mortality in the US is 21 per 100,000 — 50% worse than the second-worst developed country and 10 times worse than Norway. This isn't a healthcare problem alone; it's the signature of a society where inequality has stripped away the basic safety net. Grantham suggests Denmark, Japan, Germany, or France as better places to raise a family.
Chapter 39 · 1:35:18
The Flaw That Destroys Societies
Grantham cites maternal mortality as the single best measure of civilisation. US: 21/100,000 — 50% worse than the second-worst developed nation; Norway: near zero. Denmark, Japan, France, Germany are better places to live in the things that actually matter.
Claims made here
The US maternal mortality rate is approximately 21 per 100,000 births — 50% worse than the second-worst developed country — compared to near zero in Norway.
The US has a maternal mortality rate of approximately 21 per 100,000 births, compared to near zero in Norway, making the US 50% worse than the second-worst developed nation.
No indexed bits in this chapter.
Show stoppers
Human sperm counts have plummeted from 180 million to 35 million units per milliliter since hunter-gatherer times, with the decline accelerating at 2.5% per year. In 20-25 years, the average couple will need medical help to conceive. This is tomorrow — not some distant future problem.
At a 1998 investment conference, 99% of 400 professional analysts privately agreed the overpriced market would crash — guaranteeing a major bear market. Yet their employers were on stage telling clients everything was fine. This conflict of interest hasn't changed and never will.
Snapshots ()
Key Quotes ()
This episode
Cast
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Discussed as the master of using inflated stock narratives to fund real-world operations; Grantham says the SpaceX story requires him to repeat the Tesla trick but in a worse market cycle.
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AI pioneer and Nobel Prize winner cited as a key voice warning about AI existential risk; argues a higher intelligence being benevolent to a lower one has only one precedent: mothers to babies.
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Epidemiologist whose research documented the global decline in sperm counts; her projections suggest median sperm count could hit zero by 2045.
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Discussed as the prime example of bubble-era euphoria; Grantham says it will fail to deliver on its prospectus promises and compares it to the South Sea Bubble.
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Contrasted with the US as a significantly more protective regulatory environment, having banned 1,500 cosmetic chemicals versus the US's 12.
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Track
Discussed as an example of how Elon Musk used inflated stock valuations to fund factory construction — a playbook Grantham argues SpaceX cannot repeat.
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Discussed as an example of a company with a former monopoly on smartphones now competing in the AI space; used as an example of a corporate bond issuer.
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Jeremy Grantham's institutional investment firm in Boston, currently managing $85 billion in assets.
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Used as the defining example of how bubble-era stocks collapse (down 92%) before eventually dominating their sector from the wreckage.
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Cited as the institution that conducted the pivotal fertility-diet studies showing dietary pesticide exposure has a dramatic impact on sperm count and live birth rates.
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Cited as one of the Magnificent 7, historically dominant in chips but now competing in the AI arms race.
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US large-cap stock index repeatedly cited by Grantham as overvalued and one to avoid; has risen 25% in the last 12 months versus 65% for emerging markets.
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AI assistant discussed as an example of a model programmed for benevolence, becoming judgmental and restrictive in ways that may cause users to switch to competitors.
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Grantham says Bitcoin will eventually go to zero and dismisses it as an unnecessary piece of nonsense that primarily facilitates criminal activity.
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SpaceX's satellite internet division; Grantham distinguishes it as a genuinely good business making money, separate from SpaceX's inflated AI and asteroid-mining narrative.
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Central subject of concern throughout; Grantham warns it has the most overvalued stock market, poorest chemical regulation, worst maternal mortality in the developed world, and the fastest-dissolving social contract.
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Used as the ultimate cautionary tale: its stock market peaked in 1989 at 65x earnings, took 35 years to recover, and its 20-year-old population is now 50% of what it was in 1948 due to demographic collapse.
Stats
This episode
Claims & Sources
Factual claims made this episode, and whether a source was named.
The current US AI-driven stock market is the biggest investment bubble in American history, larger than the dot-com bubble of 2000.
Amazon fell 92% during the dot-com crash despite having risen 6-7 times before the peak.
The Japanese stock market peaked in 1989 at 65 times earnings and took 35 years to fully recover.
From 2000 to 2010, US equity investors lost money — they had less money after 10 years than they started with.
UK house prices rose from 3.4 times annual family income in 1994 to over 10 times today.
Global sperm count has declined from approximately 100 million units/ml in 1970 to 35 million today, with the decline accelerating at 2.5% per year.
Dr. Shanna Swan's projection indicates the median male sperm count is on track to hit zero by 2045 if current trends continue.
The World Health Organization estimates that approximately 17% of young couples currently need some help getting pregnant.
A Harvard and Mass General Hospital study of 180 men found that those eating the fewest pesticide-contaminated foods had double the sperm count of those eating the most contaminated diet.
In a follow-up Harvard study of women, those with the cleanest diets had a 68% live birth rate versus 38% for those in the worst dietary quartile.
The EU has banned 1,500 chemicals from cosmetics; Canada has banned 550; the US FDA has banned only 12.
The life expectancy gap between the US and Sweden has grown from 2 years to 6 years over the last 70 years.
The US maternal mortality rate is approximately 21 per 100,000 births — 50% worse than the second-worst developed country — compared to near zero in Norway.
The US allows 85 agricultural pesticides that are completely banned in the EU, China, and Brazil.
A US Geological Survey found that at least 45% of all US tap water is contaminated with PFAS forever chemicals.
A UC Berkeley peer-reviewed study found atrazine exposure at levels below the EPA's safe drinking water limit chemically castrated male frogs and turned 10% into fully functional females capable of laying eggs.
Microplastics were found in 100% of human testicular tissue samples in a major 2024 study.
The richest 1% of Americans control 31% of the nation's wealth while the bottom 50% share just 2.5%.
In Japan, the population of 20-year-olds today is only 50% of what it was in 1948, driven by sustained demographic decline.
Flying insect biomass has declined by 50-75% over the last 60-70 years.
