HEAT: The Built World (Episode 135 – Part 2 of 4)

SHOW NOTES Faced with a limit built into our own flesh, we did the most human thing imaginable: we invented our way around it. This episode is about the machine that makes cold on demand — one of the most genuinely useful things our species has ever built, and one that quietly runs up an enormous bill. We trace the whole arc: how air conditioning broke heat's ancient ceiling on where humans could live and work, the invisible refrigerants that leak out as greenhouse gases thousands of times st...