Experts agree that humans can only comfortably survive in the thermoneutral zone, a surprisingly narrow Goldilocks range between 17 and 24 degrees Celsius. This gives us a problem as climate change pushes up summer temperatures alarmingly, resulting in record heatwaves around the world. Already, about 12 per cent of the Earth’s land area is uninhabitable due to deadly climate conditions. This is set to rise to over 45 per cent by 2100, with at least 44 per cent of the world’s population likely...