On November 15th 2022, the world’s population reached 8 billion people, a milestone in human development. This unprecedented growth is due to the gradual increase in human lifespan owing to improvements in public health, nutrition, personal hygiene, and medicine. It is also the result of high and persistent levels of fertility in some countries.
 　China has more people than any country in the world, but its population will start declining as early as 2023 and India will surpass it.
 　The world is getting hotter and more crowded, and the two issues are connected but not as much as people think. The key issue isn’t the number of people. In fact, 80% of the population emits a small fraction of emissions.

　二○二二年十一月十五日，世界人口達八十億，是人類發展的里程碑。公共衛生、營養、個人衛生及醫藥上的進步使人類壽命越來越長，才有這前所未有的人口增長。部分國家生育率持續居高不下也是原因。
　中國擁有全世界最多的人口，但最快在二○二三就會開始下降，被印度超越。
　世界將變得更熱更擠，而這兩項議題的影響因素，並不如大家想的那樣。關鍵不在人數，事實上，有八成人口是低排碳汙染。