#218 – Hugh White on why Trump is abandoning US hegemony – and that’s probably good

#218 – Hugh White on why Trump is abandoning US hegemony – and that’s probably good

For decades, US allies have slept soundly under the protection of America’s overwhelming military might. Donald Trump — with his threats to ditch NATO, seize Greenland, and abandon Taiwan — seems hell-bent on shattering that comfort.

But according to Hugh White — one of the world's leading strategic thinkers, emeritus professor at the Australian National University, and author of Hard New World: Our Post-American Future — Trump isn't destroying American hegemony. He's simply revealing that it's already gone.

Links to learn more, video, highlights, and full transcript: https://80k.info/hw

“Trump has very little trouble accepting other great powers as co-equals,” Hugh explains. And that happens to align perfectly with a strategic reality the foreign policy establishment desperately wants to ignore: fundamental shifts in global power have made the costs of maintaining a US-led hegemony prohibitively high.

Even under Biden, when Russia invaded Ukraine, the US sent weapons but explicitly ruled out direct involvement. Ukraine matters far more to Russia than America, and this “asymmetry of resolve” makes Putin’s nuclear threats credible where America’s counterthreats simply aren’t. Hugh’s gloomy prediction: “Europeans will end up conceding to Russia whatever they can’t convince the Russians they’re willing to fight a nuclear war to deny them.”

The Pacific tells the same story. Despite Obama’s “pivot to Asia” and Biden’s tough talk about “winning the competition for the 21st century,” actual US military capabilities there have barely budged while China’s have soared, along with its economy — which is now bigger than the US’s, as measured in purchasing power. Containing China and defending Taiwan would require America to spend 8% of GDP on defence (versus 3.5% today) — and convince Beijing it’s willing to accept Los Angeles being vaporised.

Unlike during the Cold War, no president — Trump or otherwise — can make that case to voters.

Our new “multipolar” future, split between American, Chinese, Russian, Indian, and European spheres of influence, is a “darker world” than the golden age of US dominance. But Hugh’s message is blunt: for better or worse, 35 years of American hegemony are over.

Recorded 30/5/2025.

Chapters:

  • 00:00:00 Cold open
  • 00:01:25 US dominance is already gone
  • 00:03:26 US hegemony was the weird aberration
  • 00:13:08 Why the US bothered being the 'new Rome'
  • 00:23:25 Evidence the US is accepting the multipolar global order
  • 00:36:41 How Trump is advancing the inevitable
  • 00:43:21 Rubio explicitly favours this outcome
  • 00:45:42 Trump is half-right that the US was being ripped off
  • 00:50:14 It doesn't matter if the next president feels differently
  • 00:56:17 China's population is shrinking, but it doesn't matter
  • 01:06:07 Why Hugh disagrees with other realists like Mearsheimer
  • 01:10:52 Could the US be persuaded to spend 2x on defence?
  • 01:16:22 A multipolar world is bad, but better than nuclear war
  • 01:21:46 Will the US invade Panama? Greenland? Canada?!
  • 01:32:01 What should everyone else do to protect themselves in this new world?
  • 01:39:41 Europe is strong enough to take on Russia
  • 01:44:03 But the EU will need nuclear weapons
  • 01:48:34 Cancel (some) orders for US fighter planes
  • 01:53:40 Taiwan is screwed, even with its AI chips
  • 02:04:12 South Korea has to go nuclear too
  • 02:08:08 Japan will go nuclear, but can't be a regional leader
  • 02:11:44 Australia is defensible but needs a totally different military
  • 02:17:19 AGI may or may not overcome existing nuclear deterrence
  • 02:34:24 How right is realism?
  • 02:40:17 Has a country ever gone to war over morality alone?
  • 02:44:45 Hugh's message for Americans
  • 02:47:12 Why America temporarily stopped being isolationist

Tell us what you thought! https://forms.gle/AM91VzL4BDroEe6AA

Video editing: Simon Monsour
Audio engineering: Ben Cordell, Milo McGuire, Simon Monsour, and Dominic Armstrong
Music: Ben Cordell
Transcriptions and web: Katy Moore

Jaksot(293)

#67 Classic episode – David Chalmers on the nature and ethics of consciousness

#67 Classic episode – David Chalmers on the nature and ethics of consciousness

Rebroadcast: this episode was originally released in December 2019. What is it like to be you right now? You're seeing this text on the screen, smelling the coffee next to you, and feeling the warmth of the cup. There’s a lot going on in your head — your conscious experience. Now imagine beings that are identical to humans, but for one thing: they lack this conscious experience. If you spill your coffee on them, they’ll jump like anyone else, but inside they'll feel no pain and have no thoughts: the lights are off. The concept of these so-called 'philosophical zombies' was popularised by today’s guest — celebrated philosophy professor David Chalmers — in order to explore the nature of consciousness. In a forthcoming book he poses a classic 'trolley problem': "Suppose you have a conscious human on one train track, and five non-conscious humanoid zombies on another. If you do nothing, a trolley will hit and kill the conscious human. If you flip a switch to redirect the trolley, you can save the conscious human, but in so doing kill the five non-conscious humanoid zombies. What should you do?" Many people think you should divert the trolley, precisely because the lack of conscious experience means the moral status of the zombies is much reduced or absent entirely. So, which features of consciousness qualify someone for moral consideration? One view is that the only conscious states that matter are those that have a positive or negative quality, like pleasure and suffering. But Dave’s intuitions are quite different. Links to learn more, summary and full transcript. Instead of zombies he asks us to consider 'Vulcans', who can see and hear and reflect on the world around them, but are incapable of experiencing pleasure or pain. Now imagine a further trolley problem: suppose you have a normal human on one track, and five Vulcans on the other. Should you divert the trolley to kill the five Vulcans in order to save the human? Dave firmly believes the answer is no, and if he's right, pleasure and suffering can’t be the only things required for moral status. The fact that Vulcans are conscious in other ways must matter in itself. Dave is one of the world's top experts on the philosophy of consciousness. He helped return the question 'what is consciousness?' to the centre stage of philosophy with his 1996 book 'The Conscious Mind', which argued against then-dominant materialist theories of consciousness. This comprehensive interview, at over four hours long, outlines each contemporary theory of consciousness, what they have going for them, and their likely ethical implications. Those theories span the full range from illusionism, the idea that consciousness is in some sense an 'illusion', to panpsychism, according to which it's a fundamental physical property present in all matter. These questions are absolutely central for anyone who wants to build a positive future. If insects were conscious our treatment of them could already be an atrocity. If computer simulations of people will one day be conscious, how will we know, and how should we treat them? And what is it about consciousness that matters, if anything? Dave Chalmers is probably the best person on the planet to ask these questions, and Rob & Arden cover this and much more over the course of what is both our longest ever episode, and our personal favourite so far. Get this episode by subscribing to our show on the world’s most pressing problems and how to solve them: search for 80,000 Hours in your podcasting app. The 80,000 Hours Podcast is produced by Keiran Harris.

3 Tammi 20224h 42min

#59 Classic episode - Cass Sunstein on how change happens, and why it's so often abrupt & unpredictable

#59 Classic episode - Cass Sunstein on how change happens, and why it's so often abrupt & unpredictable

Rebroadcast: this episode was originally released in June 2019. It can often feel hopeless to be an activist seeking social change on an obscure issue where most people seem opposed or at best indifferent to you. But according to a new book by Professor Cass Sunstein, they shouldn't despair. Large social changes are often abrupt and unexpected, arising in an environment of seeming public opposition. The Communist Revolution in Russia spread so swiftly it confounded even Lenin. Seventy years later the Soviet Union collapsed just as quickly and unpredictably. In the modern era we have gay marriage, #metoo and the Arab Spring, as well as nativism, Euroskepticism and Hindu nationalism. How can a society that so recently seemed to support the status quo bring about change in years, months, or even weeks? Sunstein — co-author of Nudge, Obama White House official, and by far the most cited legal scholar of the late 2000s — aims to unravel the mystery and figure out the implications in his new book How Change Happens. He pulls together three phenomena which social scientists have studied in recent decades: preference falsification, variable thresholds for action, and group polarisation. If Sunstein is to be believed, together these are a cocktail for social shifts that are chaotic and fundamentally unpredictable.Links to learn more, summary and full transcript. In brief, people constantly misrepresent their true views, even to close friends and family. They themselves aren't quite sure how socially acceptable their feelings would have to become, before they revealed them, or joined a campaign for social change. And a chance meeting between a few strangers can be the spark that radicalises a handful of people, who then find a message that can spread their views to millions. According to Sunstein, it's "much, much easier" to create social change when large numbers of people secretly or latently agree with you. But 'preference falsification' is so pervasive that it's no simple matter to figure out when that's the case. In today's interview, we debate with Sunstein whether this model of cultural change is accurate, and if so, what lessons it has for those who would like to shift the world in a more humane direction. We discuss: • How much people misrepresent their views in democratic countries. • Whether the finding that groups with an existing view tend towards a more extreme position would stand up in the replication crisis. • When is it justified to encourage your own group to polarise? • Sunstein's difficult experiences as a pioneer of animal rights law. • Whether activists can do better by spending half their resources on public opinion surveys. • Should people be more or less outspoken about their true views? • What might be the next social revolution to take off? • How can we learn about social movements that failed and disappeared? • How to find out what people really think. Get this episode by subscribing to our podcast on the world’s most pressing problems: type 80,000 Hours into your podcasting app. Or read the transcript on our site. The 80,000 Hours Podcast is produced by Keiran Harris.

27 Joulu 20211h 43min

#119 – Andrew Yang on our very long-term future, and other topics most politicians won’t touch

#119 – Andrew Yang on our very long-term future, and other topics most politicians won’t touch

Andrew Yang — past presidential candidate, founder of the Forward Party, and leader of the 'Yang Gang' — is kind of a big deal, but is particularly popular among listeners to The 80,000 Hours Podcast. Maybe that's because he's willing to embrace topics most politicians stay away from, like universal basic income, term limits for members of Congress, or what might happen when AI replaces whole industries. Links to learn more, summary and full transcript. But even those topics are pretty vanilla compared to our usual fare on The 80,000 Hours Podcast. So we thought it’d be fun to throw Andrew some stranger or more niche questions we hadn't heard him comment on before, including: 1. What would your ideal utopia in 500 years look like? 2. Do we need more public optimism today? 3. Is positively influencing the long-term future a key moral priority of our time? 4. Should we invest far more to prevent low-probability risks? 5. Should we think of future generations as an interest group that's disenfranchised by their inability to vote? 6. The folks who worry that advanced AI is going to go off the rails and destroy us all... are they crazy, or a valuable insurance policy? 7. Will people struggle to live fulfilling lives once AI systems remove the economic need to 'work'? 8. Andrew is a huge proponent of ranked-choice voting. But what about 'approval voting' — where basically you just get to say “yea” or “nay” to every candidate that's running — which some experts prefer? 9. What would Andrew do with a billion dollars to keep the US a democracy? 10. What does Andrew think about the effective altruism community? 11. What's one thing we should do to reduce the risk of nuclear war? 12. Will Andrew's new political party get Trump elected by splitting the vote, the same way Nader got Bush elected back in 2000? As it turns out, Rob and Andrew agree on a lot, so the episode is less a debate than a chat about ideas that aren’t mainstream yet... but might be one day. They also talk about: • Andrew’s views on alternative meat • Whether seniors have too much power in American society • Andrew’s DC lobbying firm on behalf of humanity • How the rest of the world could support the US • The merits of 18-year term limits • What technologies Andrew is most excited about • How much the US should spend on foreign aid • Persistence and prevalence of inflation in the US economy • And plenty more Chapters:Rob’s intro (00:00:00)The interview begins (00:01:38)Andrew’s hopes for the year 2500 (00:03:10)Tech over the next century (00:07:03)Utopia for realists (00:10:41)Most likely way humanity fails (00:12:43)What Andrew would do with a billion dollars (00:14:44)Approval voting vs. ranked-choice voting (00:19:51)The worry that third party candidates could cause harm (00:21:12)Investment in existential risk reduction (00:25:18)Future generations as a disenfranchised interest group (00:30:37)Humanity Forward (00:32:05)Best way the rest of the world could support the US (00:37:17)Recent advances in AI (00:39:56)Artificial general intelligence (00:46:38)The Windfall Clause (00:49:39)The alignment problem (00:53:02)18-year term limits (00:56:21)Effective altruism and longtermism (01:00:44)Persistence and prevalence of inflation in the US economy (01:01:25)Downsides of policies Andrew advocates for (01:02:08)What Andrew would have done differently with COVID (01:04:54)Fighting for attention in the media (01:09:25)Right ballpark level of foreign aid for the US (01:11:15)Government science funding (01:11:58)Nuclear weapons policy (01:15:06)US-China relationship (01:16:20)Human challenge trials (01:18:59)Forecasting accuracy (01:20:17)Upgrading public schools (01:21:41)Producer: Keiran HarrisAudio mastering: Ben CordellTranscriptions: Katy Moore

20 Joulu 20211h 25min

#118 – Jaime Yassif on safeguarding bioscience to prevent catastrophic lab accidents and bioweapons development

#118 – Jaime Yassif on safeguarding bioscience to prevent catastrophic lab accidents and bioweapons development

If a rich country were really committed to pursuing an active biological weapons program, there’s not much we could do to stop them. With enough money and persistence, they’d be able to buy equipment, and hire people to carry out the work. But what we can do is intervene before they make that decision. Today’s guest, Jaime Yassif — Senior Fellow for global biological policy and programs at the Nuclear Threat Initiative (NTI) — thinks that stopping states from wanting to pursue dangerous bioscience in the first place is one of our key lines of defence against global catastrophic biological risks (GCBRs). Links to learn more, summary and full transcript. It helps to understand why countries might consider developing biological weapons. Jaime says there are three main possible reasons: 1. Fear of what their adversary might be up to 2. Belief that they could gain a tactical or strategic advantage, with limited risk of getting caught 3. Belief that even if they are caught, they are unlikely to be held accountable In response, Jaime has developed a three-part recipe to create systems robust enough to meaningfully change the cost-benefit calculation. The first is to substantially increase transparency. If countries aren’t confident about what their neighbours or adversaries are actually up to, misperceptions could lead to arms races that neither side desires. But if you know with confidence that no one around you is pursuing a biological weapons programme, you won’t feel motivated to pursue one yourself. The second is to strengthen the capabilities of the United Nations’ system to investigate the origins of high-consequence biological events — whether naturally emerging, accidental or deliberate — and to make sure that the responsibility to figure out the source of bio-events of unknown origin doesn’t fall between the cracks of different existing mechanisms. The ability to quickly discover the source of emerging pandemics is important both for responding to them in real time and for deterring future bioweapons development or use. And the third is meaningful accountability. States need to know that the consequences for getting caught in a deliberate attack are severe enough to make it a net negative in expectation to go down this road in the first place. But having a good plan and actually implementing it are two very different things, and today’s episode focuses heavily on the practical steps we should be taking to influence both governments and international organisations, like the WHO and UN — and to help them maximise their effectiveness in guarding against catastrophic biological risks. Jaime and Rob explore NTI’s current proposed plan for reducing global catastrophic biological risks, and discuss: • The importance of reducing emerging biological risks associated with rapid technology advances • How we can make it a lot harder for anyone to deliberately or accidentally produce or release a really dangerous pathogen • The importance of having multiples theories of risk reduction • Why Jaime’s more focused on prevention than response • The history of the Biological Weapons Convention • Jaime’s disagreements with the effective altruism community • And much more And if you might be interested in dedicating your career to reducing GCBRs, stick around to the end of the episode to get Jaime’s advice — including on how people outside of the US can best contribute, and how to compare career opportunities in academia vs think tanks, and nonprofits vs national governments vs international orgs. Chapters:Rob’s intro (00:00:00)The interview begins (00:02:32)Categories of global catastrophic biological risks (00:05:24)Disagreements with the effective altruism community (00:07:39)Stopping the first person from getting infected (00:11:51)Shaping intent (00:15:51)Verification and the Biological Weapons Convention (00:25:31)Attribution (00:37:15)How to actually implement a new idea (00:50:54)COVID-19: natural pandemic or lab leak? (00:53:31)How much can we rely on traditional law enforcement to detect terrorists? (00:58:20)Constraining capabilities (01:01:24)The funding landscape (01:06:56)Oversight committees (01:14:20)Just winning the argument (01:20:17)NTI’s vision (01:27:39)Suppliers of goods and services (01:33:24)Publishers (01:39:41)Biggest weaknesses of NTI platform (01:42:29)Careers (01:48:31)How people outside of the US can best contribute (01:54:10)Academia vs think tanks vs nonprofits vs government (01:59:21)International cooperation (02:05:40)Best things about living in the US, UK, China, and Israel (02:11:16)Producer: Keiran HarrisAudio mastering: Ryan KesslerTranscriptions: Katy Moore

13 Joulu 20212h 15min

#117 – David Denkenberger on using paper mills and seaweed to feed everyone in a catastrophe, ft Sahil Shah

#117 – David Denkenberger on using paper mills and seaweed to feed everyone in a catastrophe, ft Sahil Shah

If there's a nuclear war followed by nuclear winter, and the sun is blocked out for years, most of us are going to starve, right? Well, currently, probably we would, because humanity hasn't done much to prevent it. But it turns out that an ounce of forethought might be enough for most people to get the calories they need to survive, even in a future as grim as that one.Today's guest is engineering professor Dave Denkenberger, who co-founded the Alliance to Feed the Earth in Disasters (ALLFED), which has the goal of finding ways humanity might be able to feed itself for years without relying on the sun. Over the last seven years, Dave and his team have turned up options from the mundane, like mushrooms grown on rotting wood, to the bizarre, like bacteria that can eat natural gas or electricity itself.Links to learn more, summary and full transcript. One option stands out as potentially able to feed billions: finding a way to eat wood ourselves. Even after a disaster, a huge amount of calories will be lying around, stored in wood and other plant cellulose. The trouble is that, even though cellulose is basically a lot of sugar molecules stuck together, humans can't eat wood. But we do know how to turn wood into something people can eat. We can grind wood up in already existing paper mills, then mix the pulp with enzymes that break the cellulose into sugar and the hemicellulose into other sugars. Another option that shows a lot of promise is seaweed. Buffered by the water around them, ocean life wouldn't be as affected by the lower temperatures resulting from the sun being obscured. Sea plants are also already used to growing in low light, because the water above them already shades them to some extent. Dave points out that "there are several species of seaweed that can still grow 10% per day, even with the lower light levels in nuclear winter and lower temperatures. ... Not surprisingly, with that 10% growth per day, assuming we can scale up, we could actually get up to 160% of human calories in less than a year." Of course it will be easier to scale up seaweed production if it's already a reasonably sized industry. At the end of the interview, we're joined by Sahil Shah, who is trying to expand seaweed production in the UK with his business Sustainable Seaweed. While a diet of seaweed and trees turned into sugar might not seem that appealing, the team at ALLFED also thinks several perfectly normal crops could also make a big contribution to feeding the world, even in a truly catastrophic scenario. Those crops include potatoes, canola, and sugar beets, which are currently grown in cool low-light environments. Many of these ideas could turn out to be misguided or impractical in real-world conditions, which is why Dave and ALLFED are raising money to test them out on the ground. They think it's essential to show these techniques can work so that should the worst happen, people turn their attention to producing more food rather than fighting one another over the small amount of food humanity has stockpiled. In this conversation, Rob, Dave, and Sahil discuss the above, as well as: • How much one can trust the sort of economic modelling ALLFED does • Bacteria that turn natural gas or electricity into protein • How to feed astronauts in space with nuclear power • What individuals can do to prepare themselves for global catastrophes • Whether we should worry about humanity running out of natural resources • How David helped save $10 billion worth of electricity through energy efficiency standards • And much moreChapters:Rob’s intro (00:00:00)The interview begins (00:02:36)Resilient foods recap (00:04:27)Cost effectiveness recap (00:08:07)Turning fiber or wood or cellulose into sugar (00:10:30)Redirecting human-edible food away from animals (00:22:46)Seaweed production (00:26:33)Crops that can handle lower temperatures or lower light (00:35:24)Greenhouses (00:40:51)How much to trust this economic modeling (00:43:50)Global cooperation (00:51:16)People feeding themselves using these methods (00:57:15)NASA and ALLFED (01:04:47)Kinds of catastrophes (01:15:16)Is New Zealand overrated? (01:25:35)Should listeners be doing anything to prepare for possible disasters? (01:28:43)Cost effectiveness of work on EMPs (01:30:43)The future of ALLFED (01:33:34)Opportunities at ALLFED (01:40:49)Why Dave is optimistic around bigger-picture scarcity issues (01:46:58)Energy return on energy invested (01:56:36)Nitrogen and phosphorus (02:03:25)Energy and food prices (02:07:18)Sustainable Seaweed with Sahil Shah (02:21:44)Locusts (02:38:33)The effect of COVID on food supplies (02:44:01)How much food prices would spike in a disaster (02:50:46)How Dave helped to save ~$10 billion worth of energy (02:56:33)What it’s like to live in Alaska (03:03:18)Producer: Keiran HarrisAudio mastering: Ben CordellTranscriptions: Katy Moore

29 Marras 20213h 8min

#116 – Luisa Rodriguez on why global catastrophes seem unlikely to kill us all

#116 – Luisa Rodriguez on why global catastrophes seem unlikely to kill us all

If modern human civilisation collapsed — as a result of nuclear war, severe climate change, or a much worse pandemic than COVID-19 — billions of people might die.That's terrible enough to contemplate. But what’s the probability that rather than recover, the survivors would falter and humanity would actually disappear for good?It's an obvious enough question, but very few people have spent serious time looking into it -- possibly because it cuts across history, economics, and biology, among many other fields. There's no Disaster Apocalypse Studies department at any university, and governments have little incentive to plan for a future in which their country probably no longer even exists.The person who may have spent the most time looking at this specific question is Luisa Rodriguez — who has conducted research at Rethink Priorities, Oxford University's Future of Humanity Institute, the Forethought Foundation, and now here, at 80,000 Hours.Links to learn more, summary and full transcript. She wrote a series of articles earnestly trying to foresee how likely humanity would be to recover and build back after a full-on civilisational collapse. There are a couple of main stories people put forward for how a catastrophe like this would kill every single human on Earth — but Luisa doesn’t buy them. Story 1: Nuclear war has led to nuclear winter. There's a 10-year period during which a lot of the world is really inhospitable to agriculture. The survivors just aren't able to figure out how to feed themselves in the time period, so everyone dies of starvation or cold. Why Luisa doesn’t buy it: Catastrophes will almost inevitably be non-uniform in their effects. If 80,000 people survive, they’re not all going to be in the same city — it would look more like groups of 5,000 in a bunch of different places. People in some places will starve, but those in other places, such as New Zealand, will be able to fish, eat seaweed, grow potatoes, and find other sources of calories. It’d be an incredibly unlucky coincidence if the survivors of a nuclear war -- likely spread out all over the world -- happened to all be affected by natural disasters or were all prohibitively far away from areas suitable for agriculture (which aren’t the same areas you’d expect to be attacked in a nuclear war). Story 2: The catastrophe leads to hoarding and violence, and in addition to people being directly killed by the conflict, it distracts everyone so much from the key challenge of reestablishing agriculture that they simply fail. By the time they come to their senses, it’s too late -- they’ve used up too much of the resources they’d need to get agriculture going again. Why Luisa doesn’t buy it: We‘ve had lots of resource scarcity throughout history, and while we’ve seen examples of conflict petering out because basic needs aren’t being met, we’ve never seen the reverse. And again, even if this happens in some places -- even if some groups fought each other until they literally ended up starving to death — it would be completely bizarre for it to happen to every group in the world. You just need one group of around 300 people to survive for them to be able to rebuild the species. In this wide-ranging and free-flowing conversation, Luisa and Rob also cover: • What the world might actually look like after one of these catastrophes • The most valuable knowledge for survivors • How fast populations could rebound • ‘Boom and bust’ climate change scenarios • And much more Chapters:Rob’s intro (00:00:00)The interview begins (00:02:37)Recovering from a serious collapse of civilization (00:11:41)Existing literature (00:14:52)Fiction (00:20:42)Types of disasters (00:23:13)What the world might look like after a catastrophe (00:29:09)Nuclear winter (00:34:34)Stuff that might stick around (00:38:58)Grace period (00:42:39)Examples of human ingenuity in tough situations (00:48:33)The most valuable knowledge for survivors (00:57:23)Would people really work together? (01:09:00)Radiation (01:27:08)Learning from the worst pandemics (01:31:40)Learning from fallen civilizations (01:36:30)Direct extinction (01:45:30)Indirect extinction (02:01:53)Rapid recovery vs. slow recovery (02:05:01)Risk of culture shifting against science and tech (02:15:33)Resource scarcity (02:23:07)How fast could populations rebound (02:37:07)Implications for what we ought to do right now (02:43:52)How this work affected Luisa’s views (02:54:00)Boom and bust climate change scenarios (02:57:06)Stagnation and cold wars (03:01:18)How Luisa met her biological father (03:18:23)If Luisa had to change careers (03:40:38)Producer: Keiran HarrisAudio mastering: Ben CordellTranscriptions: Katy Moore

19 Marras 20213h 45min

#115 – David Wallace on the many-worlds theory of quantum mechanics and its implications

#115 – David Wallace on the many-worlds theory of quantum mechanics and its implications

Quantum mechanics — our best theory of atoms, molecules, and the subatomic particles that make them up — underpins most of modern physics. But there are varying interpretations of what it means, all of them controversial in their own way. Famously, quantum theory predicts that with the right setup, a cat can be made to be alive and dead at the same time. On the face of it, that sounds either meaningless or ridiculous. According to today’s guest, David Wallace — professor at the University of Pittsburgh and one of the world's leading philosophers of physics — there are three broad ways experts react to this apparent dilemma: 1. The theory must be wrong, and we need to change our philosophy to fix it. 2. The theory must be wrong, and we need to change our physics to fix it. 3. The theory is OK, and cats really can in some way be alive and dead simultaneously. (David and Rob do their best to introduce quantum mechanics in the first 35 minutes of the episode, but it isn't the easiest thing to explain via audio alone. So if you need a refresher before jumping in, we recommend checking out our links to learn more, summary and full transcript.) In 1955, physicist Hugh Everett bit the bullet on Option 3 and proposed Wallace's preferred solution to the puzzle: each time it's faced with a ‘quantum choice,’ the universe 'splits' into different worlds. Anything that has a probability greater than zero (from the perspective of quantum theory) happens in some branch — though more probable things happen in far more branches. While not a consensus position, the ‘many-worlds’ approach is one of the top three most popular ways to make sense of what's going on, according to surveys of relevant experts. Setting aside whether it's correct for a moment, one thing that's not often spelled out is what this approach would concretely imply if it were right. Is there a world where Rob (the show's host) can roll a die a million times, and it comes up 6 every time? As David explains in this episode: absolutely, that’s completely possible — and if Rob rolled a die a million times, there would be a world like that. Is there a world where Rob becomes president of the US? David thinks probably not. The things stopping Rob from becoming US president don’t seem down to random chance at the quantum level. Is there a world where Rob deliberately murdered someone this morning? Only if he’s already predisposed to murder — becoming a different person in that way probably isn’t a matter of random fluctuations in our brains. Is there a world where a horse-version of Rob hosts the 80,000 Horses Podcast? Well, due to the chance involved in evolution, it’s plausible that there are worlds where humans didn’t evolve, and intelligent horses have in some sense taken their place. And somewhere, fantastically distantly across the vast multiverse, there might even be a horse named Rob Wiblin who hosts a podcast, and who sounds remarkably like Rob. Though even then — it wouldn’t actually be Rob in the way we normally think of personal identity. Rob and David also cover: • If the many-worlds interpretation is right, should that change how we live our lives? • Are our actions getting more (or less) important as the universe splits into finer and finer threads? • Could we conceivably influence other branches of the multiverse? • Alternatives to the many-worlds interpretation • The practical value of physics today • And much more Chapters:Rob’s intro (00:00:00)The interview begins (00:02:15)Introduction to quantum mechanics (00:08:10)Why does quantum mechanics need an interpretation? (00:19:42)Quantum mechanics in basic language (00:30:37)Quantum field theory (00:33:13)Different theories of quantum mechanics (00:38:49)Many-worlds theory (00:43:14)What stuff actually happens (00:52:09)Can we count the worlds? (00:59:55)Why anyone believes any of these (01:05:01)Changing the physics (01:10:41)Changing the philosophy (01:14:21)Instrumentalism vs. realism (01:21:42)Objections to many-worlds (01:35:26)Why a consensus hasn’t emerged (01:50:59)Practical implications of the many-worlds theory (01:57:11)Are our actions getting more or less important? (02:04:21)Does utility increase? (02:12:02)Could we influence other branches? (02:17:01)Should you do unpleasant things first? (02:19:52)Progress in physics over the last 50 years (02:30:55)Practical value of physics today (02:35:24)Physics careers (02:43:56)Subjective probabilities (02:48:39)The philosophy of time (02:50:14)David’s experience at Oxford (02:59:51) Producer: Keiran HarrisAudio mastering: Ben CordellTranscriptions: Sofia Davis-Fogel and Katy Moore

12 Marras 20213h 9min

#114 – Maha Rehman on working with governments to rapidly deliver masks to millions of people

#114 – Maha Rehman on working with governments to rapidly deliver masks to millions of people

It’s hard to believe, but until recently there had never been a large field trial that addressed these simple and obvious questions:1. When ordinary people wear face masks, does it actually reduce the spread of respiratory diseases?2. And if so, how do you get people to wear masks more often?It turns out the first question is remarkably challenging to answer, but it's well worth doing nonetheless. Among other reasons, the first good trial of this prompted Maha Rehman — Policy Director at the Mahbub Ul Haq Research Centre — as well as a range of others to immediately use the findings to help tens of millions of people across South Asia, even before the results were public.Links to learn more, summary and full transcript. The groundbreaking Bangladesh RCT that inspired her to take action found that: • A 30% increase in mask wearing reduced total infections by 10%. • The effect was more pronounced for surgical masks compared to cloth masks (plus ~50% effectiveness). • Mask wearing also led to an increase in social distancing. • Of all the incentives tested, the only thing that impacted mask wearing was their colour (people preferred blue over green, and red over purple!). The research was done by social scientists at Yale, Berkeley, and Stanford, among others. It applied a program they called ‘NORM’ in half of 600 villages in which about 350,000 people lived. NORM has four components, which the researchers expected would work well for the general public: N: no-cost distribution O: offering information R: reinforcing the message and the information in the field M: modeling Basically you make sure a community has enough masks and you tell them why it’s important to wear them. You also reinforce the message periodically in markets and mosques, and via role models and promoters in the community itself. Tipped off that these positive findings were on the way, Maha took this program and rushed to put it into action in Lahore, Pakistan, a city with a population of about 13 million, before the Delta variant could sweep through the region. Maha had already been doing a lot of data work on COVID policy over the past year, and that allowed her to quickly reach out to the relevant stakeholders — getting them interested and excited. Governments aren’t exactly known for being super innovative, but in March and April Lahore was going through a very deadly third wave of COVID — so the commissioner quickly jumped on this approach, providing an endorsement as well as resources. Together with the original researchers, Maha and her team at LUMS collected baseline data that allowed them to map the mask-wearing rate in every part of Lahore, in both markets and mosques. And then based on that data, they adapted the original rural-focused model to a very different urban setting. The scale of this project was daunting, and in today’s episode Maha tells Rob all about the day-to-day experiences and stresses required to actually make it happen. They also discuss: • The challenges of data collection in this context • Disasters and emergencies she had to respond to in the middle of the project • What she learned from working closely with the Lahore Commissioner's Office • How to get governments to provide you with large amounts of data for your research • How she adapted from a more academic role to a ‘getting stuff done’ role • How to reduce waste in government procurement • And much more Chapters:Rob’s intro (00:00:00)The interview begins (00:01:33)Bangladesh RCT (00:06:24)The NORM model (00:08:34)Results of the experiment (00:10:46)Experimental design (00:20:35)Adapting the findings from Bangladesh to Lahore (00:23:55)Collecting data (00:34:09)Working with governments (00:38:38)Coordination (00:44:53)Disasters and emergencies (00:56:01)Sending out masks to every single person in Lahore (00:59:15)How Maha adapted to her role (01:07:17)Logistic aptitude (01:11:45)Disappointments (01:14:13)Procurement RCT (01:16:51)What we can learn (01:31:18)Producer: Keiran HarrisAudio mastering: Ben CordellTranscriptions: Katy Moore

22 Loka 20211h 42min

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