In this episode, we’re touring a home with a buildings doctor.  Ian Hamilton is a professor of energy, environment and health at University College London. Together, Melissa and Ian show us the parts of our homes we need to upgrade to zero out carbon emissions—and to keep us safe in a more dangerous, changing climate. They talk about insulation, heat pumps, solar panels and more.  The Big Switch is produced by Columbia University's Center on Global Energy Policy in partnership with Post Script Media. This episode was produced by Alexandria Herr and Daniel Woldorff. Theme music and mixing by Sean Marquand. Story editing by Anne Bailey. A special thanks to Natalie Volk, Kirsten Smith and Kyu Lee. Our executive editor is Stephen Lacey.  Correction: Texas experienced major power outages due to a winter storm in Februrary 2021. In the episode, Melissa mistakenly says February 2020.

Retrofitting Homes for Net Zero

To slow climate change, we need to transform our homes, buildings, cars, and economy quickly. "The Big Switch" explains how to rebuild the energy systems all around us. Dr. Melissa Lott of Columbia University brings together historical examples, current events, and incisive analysis to give listeners a deep understanding of the solutions to climate change.

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  This is the final episode of a five-part series exploring the lithium-ion battery supply chain. If you haven’t listened to the first four episodes, we recommend you start there.   So far over this season we've traced the global lithium-ion battery supply chain from mining to processing to manufacturing. And we've put it all into a geopolitical and economic context.   In this final installment of our five-part series, we come to the end of the road for a battery.    There are a lot of technical innovations on the horizon when it comes to battery recycling. But are we anywhere close to making the battery economy actually circular?   When you get rid of your car, there is a profitable industry that takes responsibility for the components inside of it. And that's because we've had many, many decades to perfect this process -- and develop efficient supply chains. The modern battery supply chain is still a work in progress.   In this episode, we’ll visit a recycling facility, learn how battery recyclers are evolving into battery component manufacturers, navigate the complexities of turning dead batteries into new ones, and explore the concept of circularity.

Part 5: The Battery Recycling Dilemma

  This is the fourth episode of a five-part series exploring the lithium-ion battery supply chain. If you haven’t listened to the first three episodes, we recommend you start there.    China has been the world's biggest battery manufacturer for over a decade. Chinese companies got in the game early, building an industry from scratch in the 2000s. By 2022, according to the IEA, China manufactured 76% of the world's batteries.   But that’s changing. Battery factories in the U.S. and around the world are running 24/7 to churn out millions of cells – thanks to growing demand for storage all over the world, and government support for local manufacturing.   In this episode, we’re exploring the rapid buildout of factories to support the battery economy. We’ll tour a lithium-ion battery factory in upstate NY to see how batteries are made at scale. And we ask where a small US factory fits into a global battery market dominated by China.

Part 4: The Great Battery Manufacturing Race

  This is the third episode of a five-part series exploring the lithium-ion battery supply chain. If you haven’t listened to the first two episodes, we recommend you start there.   Batteries can replace gasoline in our cars, or diesel in our generators, with electricity. But batteries and petroleum-based fuels share something in common: they both rely on energy-intensive processes to turn extracted materials into something useful.   The middle stage of the lithium-ion supply chain is called processing – and it's a critical one. To make lots of affordable batteries, we have to process a lot of materials. It’s a big, lucrative business with real impacts to local communities and the environment.   In this episode, we dig into step two of the supply chain: processing all those minerals into usable ingredients for batteries.   Why are countries so keen on building giant processing facilities? And can we process all the minerals we need to fight climate change in a responsible way?

Part 3: The High Stakes for Battery Ingredients

  This is the second episode of a five-part series exploring the lithium-ion battery supply chain. If you haven’t listened to the first episode, we recommend you start there.   To produce enough batteries to reach global net-zero goals, the International Energy Agency says we'll need to increase production of critical minerals by six fold by 2040. It's a monumental task.    It can feel like a contradictory mission. To save the planet, we have to mine more minerals; but mining and processing those minerals increases emissions and often negatively impacts indigenous communities and the environment.    In this episode, we start at the beginning of the battery supply chain: lithium mining.    We’ll ask why so much rides on where and how we source lithium, and whether we can balance growing demand with local communities and the land. 

Part 2: The Mining Conundrum For Critical Minerals

  We need to electrify much of the global economy in order to hit net-zero emissions by 2050. That means installing a lot of batteries in our cars, buildings, and across the grid to balance vast amounts of wind and solar.   The supply chain behind all those batteries could be worth nearly half a trillion dollars by 2030. Whoever controls that supply chain has enormous power – figuratively and literally.    In this episode, we explore the stakes of the battery-based transition. We’ll open up a lithium-ion battery, investigate what's inside it, and ask whether critical minerals will look anything like oil.   This is the first episode of a five-part series exploring the lithium-ion battery supply chain. In the next four episodes, we’ll cover each step of the process, from mining to recycling.

Retrofitting Homes for Net Zero

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