Forty years ago, your parents cooled their bedrooms with joules dredged out of coal mines and oil pits. They mined rocks and burned them, coating their lungs in the byproducts. They encased their world—your world—in a chemical heat trap. Today, that seems barbaric. You live in a cocoon of energy so clean it barely leaves a carbon trace and so cheap you can scarcely find it on your monthly bill.
