The vast majority of humanity has always lived in regions where the average annual temperatures are around 6C (43F) to 28C (82F), which is ideal for human health and food production. But this sweet spot is shifting and shrinking as a result of manmade global heating, which drops more people into what the authors describe as “near unliveable” extremes.

绝大多数人类一直生活在年平均气温在6摄氏度至28摄氏度左右的地区，这对人类健康和食品生产是理想之选。但是，由于人为的全球升温，这个"甜蜜地带"正在移动和缩小，让更多的人陷入作者称作“几乎不宜居住的”极端环境中。