What is the appropriate size of China’s total population?

The United States has had a large number of immigrants since its founding, and Europe has encouraged childbirth for many years. So far, no country's population has reached a fraction of China's. China has created a country with the largest population in the world. It is not a crime against the world, it is not a strategic mistake of thousands of years, it is not a burden to the world, but it is the wealth of the world, it is a contribution to the world, and it is a great contribution to the world. While population productivity continues to decline around the world, the value of China's population is appreciating. Whether China is increasing its population or imposing population restrictions, it is an asset that the world can learn from. China – How many Chinese people can we feed? How many Chinese people can China support? This question is of the same nature as "How many people can the earth support?" The Limits to Growth, which once caused a sensation in the world, was a prediction made by the Club of Rome in 1972 based on the system dynamics world model: "There will be no gold in 1981, no mercury in 1985, and no zinc in 1990. There will be no oil in 1992, and there will be no copper, aluminum and natural gas in 1993. "Ten years have passed in the 21st century, and the above resource depletion scenario has not occurred. The implicit formula of "The Limits to Growth" is the ratio of the total amount of resources to the rate of consumption. It oversimplifies the human development process. There is nothing wrong with the "limited resource theory". The amount of various resources on the earth, especially non-renewable resources, is indeed limited, but the way people use resources, including production methods and consumption methods, is not fixed. For example, now everyone is very concerned about oil supply, but the history of human beings using oil as energy is less than 200 years ago. The next 200 or 2000 years of human history will not be an era where it is impossible to survive without oil. Some experts believe that as to how many people China can feed, according to international standards, it can achieve self-sufficiency in food with 0.8 acres of land per capita. China’s per capita land is 1.4 acres, which is still far from this bottom line. Therefore, China now has serious shortages, difficulty selling grain, and low grain prices. China's current resource consumption (including water resources) per unit of GDP is several to more than ten times that of developed countries. There is still a lot of room for increasing revenue and reducing expenditure. As long as the extensive production methods and lifestyle are changed, more people can be fed. The world's "population champion" - China cannot lose its status in terms of population. Should it continue to be a "large country with a large population", a "country with a medium population", or a "country with a small population"? This is a question that China must answer and solve as it strives to rise as a great power and achieve national rejuvenation. The more developed countries become, the more their population needs to develop, so they do everything possible to increase their total population. China's population density is smaller than that of most developed countries. Now, developed countries are actively introducing immigrants. China is aging and it will be difficult to provide immigrants to the world. The world's immigrant population will be monopolized by populous countries such as India. This is not conducive to the spread of Chinese culture and is not conducive to safeguarding the interests of the nation overseas.

The world's total population continues to rise. Why does China want to reduce it? Is it necessary for China to learn from Lei Feng and make room for the world in terms of its total population? Is China's great rejuvenation going to be based on population shrinkage?