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A
This is not gradual. This is catastrophic. What people do, however, is ignore it. We have such a desperate predisposition for good news. And at a time like this, to find yourself facing the most optimistic bull market in American history is really a very interesting testimonial to human nature, isn't it?
B
Welcome to the Master Investor podcast with me, Wilfred Frost. I'm delighted to bring you now some bonus content from our conversation earlier this week with the founder, chairman and long term investment strategist at gmo, Jeremy Grantham. Earlier this week, we brought you his latest views on the current market. Now time to dive in to what he sees as the biggest long term threats, not just to the market, but to humanity more broadly. Jeremy, great to have you back. And before I dive into some of those risks, I think it's worth pointing out to people that you've pledged not just some, not just a majority, but over 90% of your wealth to charitable causes.
A
That's right, yes. We've handed over 90 and pledged 95.
B
Wow. So you've already handed over that 90. It's not just a kind of pledge to come.
A
Right.
B
Wow.
A
And I'm happy to say we have written checks out of the foundation for 750 million.
B
Well, thank you, I guess, on behalf of all these amazing causes that you've supported. Of the many risks you identify, there's sort of three in particular, and I want to start with the one that maybe is less talked about by others, and that's toxicity. What do you mean by toxicity?
A
Actually, we, all of us, insects and humans and everyone in between, we live in a kind of toxic stew. We've been producing Since World War II incredible quantities of chemicals for pesticides and everything else. And very many of them are either directly bad for you or leech chemicals over time into the environment that are bad for you. But my favorite category of watch your tail is pesticides because they are designed to kill our cousins, the insects, and our distant cousins, fungus and plants, weeds. It shouldn't be that unlikely that these things designed to kill great swaths of life would be damaging for humans, particularly pregnant women. That messes with endocrine disruptors, hormones that govern so much of what we do, what we think, what we feel. And in the lab, it reduces the sex drive of everything it's tested on endocrine disruptors. They absolutely expect it would do that to humans. Every survey of sexual activity in every country, every age group is dropping like a stone. They're finally beginning to write about it. But it's been going on for 20 years. But now it is really obvious and it's become quite a lively topic of conversation. And so this chemical effect, hugely underrated in this indirect way, stretches back at least 15 years. And the direct effect is that it reduces, among other things, sperm count. One of the few things in this area that you can actually measure very accurately. They started to measure the academics in 1970 or 72 and there was 100 million units per milliliter. And today it's 35. And the latest report that surveys everything says the sperm count is reducing in the 21st century at 2.5% a year, give or take per year, compared to 1.5% in the second half of the last century. It's accelerating. And every unit lost from 35 is going to be more painful, more consequential than the previous 1%. And this is the effect. Until it reached 45 units, we were so over engineered like a good Victorian bridge, that it didn't matter. You just tried a little harder, an extra week or two and you had pregnancy. After it reaches 45, we start to see a rapid, dramatic, really turn up in young couples needing help. And the leading expert came to the same estimate that we did, which I admit is a guess, but we did it separately and that is that in 20 years the average couple will need help. 20 miserable, quick passing years and the average young couple will need help getting pregnant.
B
So do you expect global populations to decline significantly?
A
Global populations will decline significantly. The Lancet series came up recently and suggested it might be 6 billion at the end of this century, not 10 billion or close, which is what the UN who have ridiculous assumptions, really. Atlantic Monthly, this issue has an article calling them on that and suggesting that 6 billion is a lot more likely. And GMO, my colleague Jamie Lee and I wrote a paper five years ago that made exactly the case, that is in this week's Atlantic Monthly and suggested that 6 billion was a much better number for 2100. What this means is that already the population of babies has been dropping in the developed world everywhere and most other places as well. That the workforce has been dropping in Europe for nearly either dropping or flat year to year for 15 years. This takes a big bite out of GDP growth. A lot of the American superiority towards the Europeans. They sneer at the Europeans as having lost the plot economically, bad policies, et cetera, et cetera, which they tend to do very easily, Americans, and they certainly have here without realizing that the main difference is that they in the US have had significantly more immigration on average and moderately more fertility Moderately more indigenous growth, and that is at least half of the difference. And the other thing, of course, is fracking, which went from the US as a second rate, declining petrochemical power to the largest producer of oil and gas in the world, which was nearly all of the growth globally coming from the us, with the effect that we had cheap natural gas, cheap power availability throughout industry, and even cheap raw materials in terms of petrochemicals, which led to enormous amount of increased gdp.
B
So another big risk, just to move on, and we can sum it up in a moment, you've been way ahead of the curve on is climate damage. Interestingly, I've read some of the things you've done recently on this. You're perhaps less concerned in your tone than you had been in the last decade at different points, because you believe innovation can save us in that regard.
A
The trouble with these topics is they are so complicated that to try and get them done in a few minutes is a heartbreaker. No, climate change is a terrible burden on us, really, because if we rise to the occasion, which we just may, and we eventually hit a carbon zero economy, everything has been greened, everything electric and so on, and with enormous use of our brains and research efforts, we could do this. It's not going to be intellectually that difficult. We have that kind of skill. It's a political will and the vested interests, the huge power of the vested interest of the current system behind pollution, which makes it doubtful.
B
Jeremy then returned to his greatest current area of concern, declining populations, the only small positive of which is declining pressure on the environment.
A
There is no chance we are not fairly well into a population crash. Yes, it's offset by old useless fogies over 65, which dampens the data. But if you look at the size of the workforce, it is declining year by year already and has been for quite a while. And that is guaranteed not only to directly affect GDP growth, but everything we do suggests it also reduces animal spirits. If you live in a world where nurseries are closing, grammar schools are closing like they are in Japan and have been for 15 years, your opportunities are getting less, you're not getting promoted at the same speed, your earnings are not rising at the rate that your parents did, you become disgruntled very easily. You can see that in Europe, you can see it in America, where we have done relatively well. But we're so unequal here that the average worker and below have not had a very good deal now for a long time. It's shocking how quickly they become disgruntled and when you're upset and disappointed, you don't reach for debt, you don't reach to extend your factory to take that risk on new production. And in that world, as animal spirits shrink, as Keynes made the point, your best laid plans can go awry. If the buyers, the consumers, become conservative, nervous, fed up, and they feel a need for more savings, your future can get dismal pretty fast. And that's, I'm afraid, pretty well guaranteed from population, current population. This is not me extrapolating 50 years in the future. This is me saying, do you know that Japan had 2.5 million babies at its peak in 1948? 50 years ago, 2 million. 10 years ago, 1 million. Today, under 700,000. That's just over a quarter of 1948. This is not theoretical, guys. This is happening starting in Japan and South Korea. China is down to a fertility rate of 1.1, which means every 30 years, the baby production nearly halves. This is not gradual. This is catastrophic. What people do, however, is ignore it. They ignore the toxicity data, they ignore the sperm count data, which is some of the best data out there. They ignore the population implications. We have such a desperate predisposition for good news. And at a time like this, when the risks, forget nuclear war, forget Russia and China and Taiwan and the Ukraine. At a time like this, to find yourself facing the most optimistic bull market in American history is really a very interesting testimonial to human nature, isn't it?
B
Well, on that note, Jeremy, we are out of time. That far from optimistic note, but nonetheless important, important lesson. And Jeremy, once again, thank you so much for joining us and to our listeners, thank you for tuning in to this bonus bit of content with the GMO founder, Jeremy Grantham. It's been a delight. Jeremy, thank you.
A
Same here. Thank you.
B
Next week we are joined by Hightower Chief Investment strategist and Portfolio Manager Stephanie Link. And remember, nothing in the Master Investor Podcast should be considered direct financial advice. More information on our show Notes if you want to look at that. The Master Investor Podcast is produced by Paradine Productions and Master Investor limited In association with Birdlime Media. If you've enjoyed the podcast, please subscribe and leave us a five star review and see you next week. Sam.
Episode Title: On Long Term Risks to the Market, and Humanity
Host: Wilfred Frost
Guest: Jeremy Grantham (Founder, Chairman, and Long-term Investment Strategist, GMO)
Release Date: July 13, 2025
In this bonus episode, legendary investor Jeremy Grantham returns to discuss the three greatest long-term risks facing both markets and humanity. Host Wilfred Frost steers the conversation into less-charted territory, focusing not only on economic threats but also on environmental and demographic crises. Grantham presents an urgent, often unsettling perspective on toxicity, climate change, and a looming population crash, emphasizing the failures of optimism and the risks of ignoring hard data.
On Catastrophic Change:
Workforce Decline:
On Optimism and Denial:
| Timestamp | Topic/Quote | |-----------|-------------------------------------------------------------------------------| | 01:15 | Grantham on his philanthropy and foundation giving | | 01:55 | Defining 'toxicity' and the threat of pesticides/endocrine disruptors | | 03:50 | Fertility crisis: Sperm count decline and global fertility implications | | 05:43 | Predicting population decline (6 billion by 2100) and economic ramifications | | 07:50 | Immigration, fracking, and the US/EU GDP growth differences | | 08:33 | Climate damage: Technological hope vs. political/vestered interests | | 09:42 | The inevitability and immediate impact of demographic decline | | 11:25 | Case study: Birthrate and fertility crash in Japan, China, and South Korea | | 12:35 | Human predisposition for good news, ignoring the real data | | 12:59 | Episode close and parting reflections |
Jeremy Grantham delivers a sobering assessment of threats facing investors, economies, and humanity itself—focusing not only on climate and markets but on profound, often neglected issues of toxicity and rapid population decline. He laments the entrenched optimism and data denial in both policy and markets, cautioning listeners that these are not distant, hypothetical risks but current realities with far-reaching consequences.
If you missed the episode, this summary captures the urgent, candid tone of Grantham’s warnings and the essential details of his argument—making clear that the biggest risks are not only financial, but existential.