The population problem is mainly caused by unbalanced birth (multiple births and fewer births) and population migration, which can only be solved by balanced birth (2. 17 births in developed countries and 2.3 births in developing countries) and regulated migration.
Demographic issues mainly include demographic issues such as age, gender, income, race, nationality, religion, education level, occupation, family size, etc. Among them, the most prominent problems are the structural problems of age (multiple births and aging of fewer children), gender (imbalance between men and women) and income (high Gini coefficient and collapse of the middle class). The problem of population age structure can only be solved by balanced birth (2. 17 in developed countries and 2.3 in developing countries). The sex structure of the population can only be solved by restricting abortion. The reasons for the problem of population income structure are very complicated, but in the end, only by expanding the middle class and making it the main body of society can we really solve it.
The population distribution problems mainly include big city diseases, environmental pollution of high-density continuous urban agglomerations, the development of large rural areas (within 200 kilometers) lacking radiation from nearby megacities, the survival dilemma of population in areas with harsh natural conditions such as ecological climate, and high-density and large-flow population migration. The problem of population distribution is mainly solved through the rational distribution of urbanization and the construction of a reasonable urban system.