Living unsustainably means you need resources beyond your immediate environment. It requires you take from others. When done on a cultural level, it's known as imperialism. When we take their land too, it's colonialism. When we take their labor, it's slavery.

All of these things are happening in the Congo. If you think solar and wind are sustainable or avoid human suffering, read Siddharth's book Cobalt Red. If you listened to my last conversation with Adam Hochschild on his book King Leopold's Ghost, you know about the west's cruelty in the Congo. It hasn't ended. Adam put me in touch with Siddharth.

The book will change your views on what we call clean, green, and renewable. Siddharth doesn't outright say it, but it seems every rechargeable battery, therefore every phone, electric vehicle, laptop, and so on should be labelled: "Produced with slave labor."

• Cobalt Red
• Reviews in the New York Times and L.A. Times

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