The following are means of reducing the population of a country except encouraging

Encouraging early marriage is not a means of reducing the population of a country. Early marriage can actually lead to an increase in population, as individuals who marry at a younger age are likely to have more children. On the other hand, emigration, family planning, and sex education are all commonly used as methods of reducing population growth. Emigration involves individuals leaving a country to live permanently in another country, which can reduce the population of the first country. Family planning involves the use of contraceptives and other methods to control the number of children a family has, which can help to slow population growth. Sex education involves providing individuals with information about reproductive health and family planning, which can also help to reduce population growth by encouraging individuals to have smaller families.