The Tokamak Problem: Can We Ever Make Fusion Practical?

Can nuclear fusion ever be practical? We explore tokamaks, plasma confinement, energy balance, and the real engineering challenges behind building a working fusion reactor—and whether fusion power will ever scale. Get Nebula using my link for 50% off an annual subscription: https://go.nebula.tv/isaacarthur Watch my exclusive video Surviving a New Ice Age: https://nebula.tv/videos/isaacarthur-... Check out Tech Altar: https://nebula.tv/techaltar?ref=isaac... 🛒 SFIA Merchandise: https://isaac-arthur-shop.fourthwall.... 🌐 Visit our Website: http://www.isaacarthur.net ❤️ Support us on Patreon:   / isaacarthur   ⭐ Support us on Subscribestar: https://www.subscribestar.com/isaac-a... 👥 Facebook Group:   / 1583992725237264   📣 Reddit Community:   / isaacarthur   🐦 Follow on Twitter / X:   / isaac_a_arthur   💬 SFIA Discord Server:   / discord   Credits: The Tokamak Problem: Can We Ever Make Fusion Practical? Written, Produced & Narrated by: Isaac Arthur Select imagery/video supplied by Getty Images Chapters 0:00 Intro 4:00 Why Fusion Is So Appealing 8:36 What Fusion Actually Is (and Isn’t) 10:49 The Sun Is Hot… and Also a Terrible Reactor 13:59 Quantum Tunneling: Winning by Statistics, Not Strength 17:59 Holding the Fire: The Plasma Problem 22:30 What Tokamaks Actually Solved 25:10 The Tokamak Problem, Precisely Stated 27:28 ITER and the Limits of Scaling 29:44 Tech Altar 30:44 What About Other Approaches?