To tackle climate change, rich nations are promising to end fossil fuel use in 29 years. As this becomes excruciatingly costly, the G7 is now thinking about making the world’s poor pay for it. That’ll go badly. The rich world has seen an incredible development on the back of enormous increases in mostly fossil fuel energy. A couple of hundred years ago, most available power came from backbreaking human work. Even by the end of the 1800s, human labour made up 94% of all industrial work in the US. Today, it constitutes just 8%. If we think of the energy we use in terms of “servants”, each with...