（Purely personal perceptions, not necessarily correct ！）

It took millions of years for humans to go from appearing to 1 billion people, but only 200 years to go from 1 billion to 8 billion.

As of June, 2022, the total global population of 238 countries is 7.898 billion. But in June 2019, the global population is only 7.579 billion. In other words, the world population has increased by more than 300 million in the past three years, despite the double impact of the epidemic and the economic downturn.

Human beings have been born for so long, Why did industrialization occur only in the past two hundred years?