Rebroadcast: this episode was originally released in October 2018. Paul Christiano is one of the smartest people I know. After our first session produced such great material, we decided to do a second recording, resulting in our longest interview so far. While challenging at times I can strongly recommend listening — Paul works on AI himself and has a very unusually thought through view of how it will change the world. This is now the top resource I'm going to refer people to if they're interested in positively shaping the development of AI, and want to understand the problem better. Even though I'm familiar with Paul's writing I felt I was learning a great deal and am now in a better position to make a difference to the world. A few of the topics we cover are:• Why Paul expects AI to transform the world gradually rather than explosively and what that would look like • Several concrete methods OpenAI is trying to develop to ensure AI systems do what we want even if they become more competent than us • Why AI systems will probably be granted legal and property rights • How an advanced AI that doesn't share human goals could still have moral value • Why machine learning might take over science research from humans before it can do most other tasks • Which decade we should expect human labour to become obsolete, and how this should affect your savings plan. • Links to learn more, summary and full transcript. • Rohin Shah's AI alignment newsletter. Here's a situation we all regularly confront: you want to answer a difficult question, but aren't quite smart or informed enough to figure it out for yourself. The good news is you have access to experts who *are* smart enough to figure it out. The bad news is that they disagree. If given plenty of time — and enough arguments, counterarguments and counter-counter-arguments between all the experts — should you eventually be able to figure out which is correct? What if one expert were deliberately trying to mislead you? And should the expert with the correct view just tell the whole truth, or will competition force them to throw in persuasive lies in order to have a chance of winning you over? In other words: does 'debate', in principle, lead to truth? According to Paul Christiano — researcher at the machine learning research lab OpenAI and legendary thinker in the effective altruism and rationality communities — this question is of more than mere philosophical interest. That's because 'debate' is a promising method of keeping artificial intelligence aligned with human goals, even if it becomes much more intelligent and sophisticated than we are. It's a method OpenAI is actively trying to develop, because in the long-term it wants to train AI systems to make decisions that are too complex for any human to grasp, but without the risks that arise from a complete loss of human oversight. If AI-1 is free to choose any line of argument in order to attack the ideas of AI-2, and AI-2 always seems to successfully defend them, it suggests that every possible line of argument would have been unsuccessful. But does that mean that the ideas of AI-2 were actually right? It would be nice if the optimal strategy in debate were to be completely honest, provide good arguments, and respond to counterarguments in a valid way. But we don't know that's the case. The 80,000 Hours Podcast is produced by Keiran Harris.

Rebroadcast: this episode was originally released in May 2018. Joseph Stalin had a life-extension program dedicated to making himself immortal. What if he had succeeded? According to Bryan Caplan in episode #32, there’s an 80% chance that Stalin would still be ruling Russia today. Today’s guest disagrees. Like Stalin he has eyes for his own immortality - including an insurance plan that will cover the cost of cryogenically freezing himself after he dies - and thinks the technology to achieve it might be around the corner. Fortunately for humanity though, that guest is probably one of the nicest people on the planet: Dr Anders Sandberg of Oxford University. Full transcript of the conversation, summary, and links to learn more. The potential availability of technology to delay or even stop ageing means this disagreement matters, so he has been trying to model what would really happen if both the very best and the very worst people in the world could live forever - among many other questions. Anders, who studies low-probability high-stakes risks and the impact of technological change at the Future of Humanity Institute, is the first guest to appear twice on the 80,000 Hours Podcast and might just be the most interesting academic at Oxford. His research interests include more or less everything, and bucking the academic trend towards intense specialization has earned him a devoted fan base. Last time we asked him why we don’t see aliens, and how to most efficiently colonise the universe. In today’s episode we ask about Anders’ other recent papers, including: • Is it worth the money to freeze your body after death in the hope of future revival, like Anders has done? • How much is our perception of the risk of nuclear war biased by the fact that we wouldn’t be alive to think about it had one happened? • If biomedical research lets us slow down ageing would culture stagnate under the crushing weight of centenarians? • What long-shot drugs can people take in their 70s to stave off death? • Can science extend human (waking) life by cutting our need to sleep? • How bad would it be if a solar flare took down the electricity grid? Could it happen? • If you’re a scientist and you discover something exciting but dangerous, when should you keep it a secret and when should you share it? • Will lifelike robots make us more inclined to dehumanise one another? Get this episode by subscribing to our podcast 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.

Rebroadcast: this episode was originally released in January 2018. Immanuel Kant is a profoundly influential figure in modern philosophy, and was one of the earliest proponents for universal democracy and international cooperation. He also thought that women have no place in civil society, that it was okay to kill illegitimate children, and that there was a ranking in the moral worth of different races. Throughout history we’ve consistently believed, as common sense, truly horrifying things by today’s standards. According to University of Oxford Professor Will MacAskill, it’s extremely likely that we’re in the same boat today. If we accept that we’re probably making major moral errors, how should we proceed?• Full transcript, key points & links to articles discussed in the show. If our morality is tied to common sense intuitions, we’re probably just preserving these biases and moral errors. Instead we need to develop a moral view that criticises common sense intuitions, and gives us a chance to move beyond them. And if humanity is going to spread to the stars it could be worth dedicating hundreds or thousands of years to moral reflection, lest we spread our errors far and wide. Will is an Associate Professor in Philosophy at Oxford University, author of Doing Good Better, and one of the co-founders of the effective altruism (EA) community. In this interview we discuss a wide range of topics: • How would we go about a ‘long reflection’ to fix our moral errors? • Will’s forthcoming book on how one should reason and act if you don't know which moral theory is correct. What are the practical implications of so-called ‘moral uncertainty’? • If we basically solve existential risks, what does humanity do next? • What are some of Will’s most unusual philosophical positions? • What are the best arguments for and against utilitarianism? • Given disagreements among philosophers, how much should we believe the findings of philosophy as a field? • What are some the biases we should be aware of within academia? • What are some of the downsides of becoming a professor? • What are the merits of becoming a philosopher? • How does the media image of EA differ to the actual goals of the community? • What kinds of things would you like to see the EA community do differently? • How much should we explore potentially controversial ideas? • How focused should we be on diversity? • What are the best arguments against effective altruism? Get this episode by subscribing: type '80,000 Hours' into your podcasting app.  The 80,000 Hours Podcast is produced by Keiran Harris.

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. • Advice on how to read our advice. • Anonymous answers on: bad habits, risk and failure. 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.  Chapters:Rob's intro (00:00:00)The interview begins (00:02:11)Philosopher’s survey (00:06:37)Free will (00:13:37)Survey correlations (00:20:06)Progress in philosophy (00:35:01)Simulations (00:51:30)The problem of consciousness (01:13:01)Dualism and panpsychism (01:26:52)Is consciousness an illusion? (01:34:52)Idealism (01:43:13)Integrated information theory (01:51:08)Moral status and consciousness (02:06:10)Higher order views of consciousness (02:11:46)The views of philosophers on eating meat (02:20:23)Artificial consciousness (02:34:25)The zombie and vulcan trolley problems (02:38:43)Illusionism and moral status (02:56:12)Panpsychism and moral status (03:06:19)Mind uploading (03:15:58)Personal identity (03:22:51)Virtual reality and the experience machine (03:28:56)Singularity (03:42:44)AI alignment (04:07:39)Careers in academia (04:23:37)Having fun disagreements (04:32:54)Rob’s outro (04:42:14) Producer: Keiran Harris.

In 1989, the professor of moral philosophy Peter Singer was all over the news for his inflammatory opinions about abortion. But the controversy stemmed from Practical Ethics — a book he’d actually released way back in 1979. It took a German translation ten years on for protests to kick off. According to Singer, he honestly didn’t expect this view to be as provocative as it became, and he certainly wasn’t aiming to stir up trouble and get attention. But after the protests and the increasing coverage of his work in German media, the previously flat sales of Practical Ethics shot up. And the negative attention he received ultimately led him to a weekly opinion column in The New York Times. • Singer's book The Life You Can Save has just been re-released as a 10th anniversary edition, available as a free e-book and audiobook, read by a range of celebrities. Get it here. • Links to learn more, summary and full transcript. Singer points out that as a result of this increased attention, many more people also read the rest of the book — which includes chapters with a real ability to do good, covering global poverty, animal ethics, and other important topics. So should people actively try to court controversy with one view, in order to gain attention for another more important one? Perhaps sometimes, but controversy can also just have bad consequences. His critics may view him as someone who says whatever he thinks, hang the consequences, but Singer says that he gives public relations considerations plenty of thought. One example is that Singer opposes efforts to advocate for open borders. Not because he thinks a world with freedom of movement is a bad idea per se, but rather because it may help elect leaders like Mr Trump. Another is the focus of the effective altruism community. Singer certainly respects those who are focused on improving the long-term future of humanity, and thinks this is important work that should continue. But he’s troubled by the possibility of extinction risks becoming the public face of the movement. He suspects there's a much narrower group of people who are likely to respond to that kind of appeal, compared to those who are drawn to work on global poverty or preventing animal suffering. And that to really transform philanthropy and culture more generally, the effective altruism community needs to focus on smaller donors with more conventional concerns. Rob is joined in this interview by Arden Koehler, the newest addition to the 80,000 Hours team, both for the interview and a post-episode discussion. They only had an hour with Peter, but also cover: • What does he think is the most plausible alternatives to consequentialism? • Is it more humane to eat wild caught animals than farmed animals? • The re-release of The Life You Can Save • His most and least strategic career decisions • Population ethics, and other arguments for and against prioritising the long-term future • What led to his changing his mind on significant questions in moral philosophy? • And more. In the post-episode discussion, Rob and Arden continue talking about: • The pros and cons of keeping EA as one big movement • Singer’s thoughts on immigration • And consequentialism with side constraints. Get this episode by subscribing to our podcast on the world’s most pressing problems and how to solve them: type 80,000 Hours into your podcasting app. Or read the linked transcript.  Producer: Keiran Harris.  Audio mastering: Ben Cordell.  Transcriptions: Zakee Ulhaq.  Illustration of Singer: Matthias Seifarth.

"…it started when the Soviet Union fell apart and there was a real desire to ensure security of nuclear materials and pathogens, and that scientists with [WMD-related] knowledge could get paid so that they wouldn't go to countries and sell that knowledge."  Ambassador Bonnie Jenkins has had an incredible career in diplomacy and global security.  Today she’s a nonresident senior fellow at the Brookings Institution and president of Global Connections Empowering Global Change, where she works on global health, infectious disease and defence innovation. In 2017 she founded her own nonprofit, the Women of Color Advancing Peace, Security and Conflict Transformation (WCAPS). But in this interview we focus on her time as Ambassador at the U.S. Department of State under the Obama administration, where she worked for eight years as Coordinator for Threat Reduction Programs in the Bureau of International Security and Nonproliferation. In that role, Bonnie coordinated the Department of State’s work to prevent weapons of mass destruction (WMD) terrorism with programmes funded by other U.S. departments and agencies, and as well as other countries. • Links to learn more, summary and full transcript. • Talks from over 100 other speakers at EA Global. • Having trouble with podcast 'chapters' on this episode? Please report any problems to keiran at 80000hours dot org. What was it like to be an ambassador focusing on an issue, rather than an ambassador of a country? Bonnie says the travel was exhausting. She could find herself in Africa one week, and Indonesia the next. She’d meet with folks going to New York for meetings at the UN one day, then hold her own meetings at the White House the next. Each event would have a distinct purpose. For one, she’d travel to Germany as a US Representative, talking about why the two countries should extend their partnership. For another, she could visit the Food and Agriculture Organization to talk about why they need to think more about biosecurity issues. No day was like the previous one. Bonnie was also a leading U.S. official in the launch and implementation of the Global Health Security Agenda discussed at length in episode 27. Before returning to government in 2009, Bonnie served as program officer for U.S. Foreign and Security Policy at the Ford Foundation. She also served as counsel on the 9/11 Commission. Bonnie was the lead staff member conducting research, interviews, and preparing commission reports on counterterrorism policies in the Office of the Secretary of Defense and on U.S. military plans targeting al-Qaeda before 9/11.  And as if that all weren't curious enough four years ago Bonnie decided to go vegan. We talk about her work so far as well as:  • How listeners can start a career like hers  • Mistakes made by Mr Obama and Mr Trump • Networking, the value of attention, and being a vegan in DC  • And 2020 Presidential candidates.Chapters:Rob’s intro (00:00:00)The interview begins (00:01:54)What is Bonnie working on at the moment? (00:02:45)Bonnie’s time at the Department of State (00:04:08)The history of Cooperative Threat Reduction work (00:08:48)Biggest uncontrolled nuclear material threats today (00:11:36)Biggest security issues in the world today (00:13:57)The Biological Weapons Convention (00:17:52)Projects Bonnie worked on that she’s particularly proud of (00:20:55)The day to day life of an Ambassador on an issue (00:23:03)Biggest misunderstandings of the field (00:25:41)How do we get more done in this area? (00:29:48)The Global Health Security Agenda (00:32:52)The implications for countries who give up WMDs (00:34:55)The fallout from a change in government (00:38:40)Listener submitted questions (00:39:39)How might listeners be able to contribute to solving these problems with their own careers? (00:54:55)Is Bonnie glad she went into the military early in her career? (01:06:25)Networking in DC (01:12:27)What are the downsides to pursuing a career like Bonnie’s? (01:15:27)Being a vegan in DC (01:16:47)Women of Color Advancing Peace, Security and Conflict Transformation (01:19:15)The value of attention in DC (01:28:25)Any ways WCAPS could accidentally make things worse? (01:30:08)Message for women of colour in the audience (01:33:05)TV shows relevant to Bonnie’s work (01:35:19)Candidates for 2020 (01:36:57) The 80,000 Hours Podcast is produced by Keiran Harris.

November 3 2020, 10:32PM: CNN, NBC, and FOX report that Donald Trump has narrowly won Florida, and with it, re-election.  November 3 2020, 11:46PM: The NY Times and Wall Street Journal report that some group has successfully hacked electronic voting systems across the country, including Florida. The malware has spread to tens of thousands of machines and deletes any record of its activity, so the returning officer of Florida concedes they actually have no idea who won the state — and don't see how they can figure it out.  What on Earth happens next?  Today’s guest — world-renowned computer security expert Bruce Schneier — thinks this scenario is plausible, and the ensuing chaos would sow so much distrust that half the country would never accept the election result.  Unfortunately the US has no recovery system for a situation like this, unlike parliamentary democracies, which can just rerun the election a few weeks later.Links to learn more, summary and full transcript.Motivating article: Information security careers for global catastrophic risk reduction by Zabel and MuehlhauserThe Constitution says the state legislature decides, and they can do so however they like; one tied local election in Texas was settled by playing a hand of poker. Elections serve two purposes. The first is the obvious one: to pick a winner. The second, but equally important, is to convince the loser to go along with it — which is why hacks often focus on convincing the losing side that the election wasn't fair. Schneier thinks there's a need to agree how this situation should be handled before something like it happens, and America falls into severe infighting as everyone tries to turn the situation to their political advantage. And to fix our voting systems, we urgently need two things: a voter-verifiable paper ballot and risk-limiting audits. According to Schneier, computer security experts look at current electronic voting machines and can barely believe their eyes. But voting machine designers never understand the security weakness of what they're designing, because they have a bureaucrat's rather than a hacker's mindset. The ideal computer security expert walks into a shop and thinks, "You know, here's how I would shoplift." They automatically see where the cameras are, whether there are alarms, and where the security guards aren't watching. In this episode we discuss this hacker mindset, and how to use a career in security to protect democracy and guard dangerous secrets from people who shouldn't get access to them.We also cover:  • How can we have surveillance of dangerous actors, without falling back into authoritarianism?  • When if ever should information about weaknesses in society's security be kept secret?  • How secure are nuclear weapons systems around the world?  • How worried should we be about deep-fakes?  • Schneier’s critiques of blockchain technology  • How technologists should be vital in shaping policy  • What are the most consequential computer security problems today?  • Could a career in information security be very useful for reducing global catastrophic risks?  • And more.Chapters:Rob’s intro (00:00:00)Bruce’s Codex talk (00:02:23)The interview begins (00:15:42)What is Bruce working on at the moment? (00:16:35)How technologists could be vital in shaping policy (00:18:52)Most consequential computer security problems today (00:24:12)How secure are nuclear weapons systems around the world? (00:34:41)Stuxnet and NotPetya (00:42:29)Messing with democracy (00:44:44)How worried should we be about deepfakes? (00:50:02)The similarities between hacking computers and potentially hacking biology in the future (00:55:08)Bruce’s critiques of crypto (01:00:05)What are some of the most kind of widely-held but incorrect beliefs among computer security people? (01:03:04)The hacking mindset (01:05:35)Voting machines (01:09:22)How secretive should people be about potentially harmful information? (01:16:48)Could a career in information security be very useful for reducing global catastrophic risks? (01:21:46)How to develop the skills needed in computer security (01:33:44)Ubiquitous surveillance (01:52:46)Why is Bruce optimistic? (02:05:28)Rob’s outro (02:06:43)The 80,000 Hours Podcast is produced by Keiran Harris.

Today's episode is a compilation of interviews I recently recorded for two other shows, Love Your Work and The Neoliberal Podcast.  If you've listened to absolutely everything on this podcast feed, you'll have heard four interviews with me already, but fortunately I don't think these two include much repetition, and I've gotten a decent amount of positive feedback on both.  First up, I speak with David Kadavy on his show, Love Your Work.  This is a particularly personal and relaxed interview. We talk about all sorts of things, including nicotine gum, plastic straw bans, whether recycling is important, how many lives a doctor saves, why interviews should go for at least 2 hours, how athletes doping could be good for the world, and many other fun topics.  • Our annual impact survey is about to close — I'd really appreciate if you could take 3–10 minutes to fill it out now.  • The blog post about this episode. At some points we even actually discuss effective altruism and 80,000 Hours, but you can easily skip through those bits if they feel too familiar.  The second interview is with Jeremiah Johnson on the Neoliberal Podcast. It starts 2 hours and 15 minutes into this recording.  Neoliberalism in the sense used by this show is not the free market fundamentalism you might associate with the term. Rather it's a centrist or even centre-left view that supports things like social liberalism, multilateral international institutions, trade, high rates of migration, racial justice, inclusive institutions, financial redistribution, prioritising the global poor, market urbanism, and environmental sustainability.  This is the more demanding of the two conversations, as listeners to that show have already heard of effective altruism, so we were able to get the best arguments Jeremiah could offer against focusing on improving the long term future of the world.  Jeremiah is more of a fan of donating to evidence-backed global health charities recommended by GiveWell, and does so himself.  I appreciate him having done his homework and forcing me to do my best to explain how well my views can stand up to counterarguments. It was a challenge for me to paint the whole picture in the half an hour we spent on longterm and I expect there's answers in there which will be fresh even for regular listeners.  I hope you enjoy both conversations! Feel free to email me with any feedback. The 80,000 Hours Podcast is produced by Keiran Harris.

1. Fill out our annual impact survey here. 2. Find a great vacancy on our job board. 3. Learn about our key ideas, and get links to our top articles. 4. Join our newsletter for an email about what's new, every 2 weeks or so. 5. Or follow our pages on Facebook and Twitter. —— Once a year 80,000 Hours runs a survey to find out whether we've helped our users have a larger social impact with their life and career. We and our donors need to know whether our services, like this podcast, are helping people enough to continue them or scale them up, and it's only by hearing from you that we can make these decisions in a sensible way. So, if 80,000 Hours' podcast, job board, articles, headhunting, advising or other projects have somehow contributed to your life or career plans, please take 3–10 minutes to let us know how. You can also let us know where we've fallen short, which helps us fix problems with what we're doing. We've refreshed the survey this year, hopefully making it easier to fill out than in the past. We'll keep this appeal up for about two weeks, but if you fill it out now that means you definitely won't forget! Thanks so much, and talk to you again in a normal episode soon. — RobTag for internal use: this RSS feed is originating in BackTracks.

Historically, progress in the field of cryptography has had major consequences. It has changed the course of major wars, made it possible to do business on the internet, and enabled private communication between both law-abiding citizens and dangerous criminals. Could it have similarly significant consequences in future? Today's guest — Vitalik Buterin — is world-famous as the lead developer of Ethereum, a successor to the cryptographic-currency Bitcoin, which added the capacity for smart contracts and decentralised organisations. Buterin first proposed Ethereum at the age of 20, and by the age of 23 its success had likely made him a billionaire. At the same time, far from indulging hype about these so-called 'blockchain' technologies, he has been candid about the limited good accomplished by Bitcoin and other currencies developed using cryptographic tools — and the breakthroughs that will be needed before they can have a meaningful social impact. In his own words, *"blockchains as they currently exist are in many ways a joke, right?"* But Buterin is not just a realist. He's also an idealist, who has been helping to advance big ideas for new social institutions that might help people better coordinate to pursue their shared goals. Links to learn more, summary and full transcript. By combining theories in economics and mechanism design with advances in cryptography, he has been pioneering the new interdiscriplinary field of 'cryptoeconomics'. Economist Tyler Cowen hasobserved that, "at 25, Vitalik appears to repeatedly rediscover important economics results from famous papers, without knowing about the papers at all." Along with previous guest Glen Weyl, Buterin has helped develop a model for so-called 'quadratic funding', which in principle could transform the provision of 'public goods'. That is, goods that people benefit from whether they help pay for them or not. Examples of goods that are fully or partially 'public goods' include sound decision-making in government, international peace, scientific advances, disease control, the existence of smart journalism, preventing climate change, deflecting asteroids headed to Earth, and the elimination of suffering. Their underprovision in part reflects the difficulty of getting people to pay for anything when they can instead free-ride on the efforts of others. Anything that could reduce this failure of coordination might transform the world. But these and other related proposals face major hurdles. They're vulnerable to collusion, might be used to fund scams, and remain untested at a small scale — not to mention that anything with a square root sign in it is going to struggle to achieve societal legitimacy. Is the prize large enough to justify efforts to overcome these challenges? In today's extensive three-hour interview, Buterin and I cover: • What the blockchain has accomplished so far, and what it might achieve in the next decade; • Why many social problems can be viewed as a coordination failure to provide a public good; • Whether any of the ideas for decentralised social systems emerging from the blockchain community could really work; • His view of 'effective altruism' and 'long-termism'; • Why he is optimistic about 'quadratic funding', but pessimistic about replacing existing voting with 'quadratic voting'; • Why humanity might have to abandon living in cities; • And much more. Get this episode by subscribing to our podcast on the world’s most pressing problems and how to solve them: type 80,000 Hours into your podcasting app. The 80,000 Hours Podcast is produced by Keiran Harris.