Somewhere below the Swedish city of Västerås, there's a big cave. During the Cold War, it was used to store oil. But the local energy company decided to clean it, pump it full of water and heat it up. Here's why they did that.
We're destroying our environment at an alarming rate. But it doesn't need to be this way. Planet A explores the shift towards an eco-friendly world and challenges the way we are dealing with climate change.