The German World Population Foundation recently pointed out that the population of the earth is increasing at a rate of 2.6 people per second, and by the middle and late 20 1 1, the total population of the world will exceed the 7 billion mark; By 2025, the world population will reach 8 billion; By 2050, the global population will increase by another 2.2 billion. At present, 82% of the world's population, or 5.7 billion people, live in developing countries and regions.

According to this calculation, the world birth rate is 1 1.7‰.

The mortality rate in Africa is relatively high. For example, in Madagascar and Malawi, the mortality rate exceeds 25 ‰; Ethiopia's ratio is 24.9‰, Gambia's ratio is 23.2‰, Angola's ratio is 23./kloc-0 ‰, and Guinea-Bissau's ratio is 23‰. There are obvious differences between 55 countries and regions in Africa and 34 countries and regions in Europe (Table 2-3). There are 37 top three companies in Africa, accounting for 67.72% of the total. However, there is no top three in Europe, and its average mortality rate is only 1 1‰. It can be seen that the mortality difference between Africa and Europe is amazing. This situation, like the birth rate, is closely related to industrial development and urbanization. Countries with high levels of industrialization and urbanization have low mortality rates. Instead, the mortality rate is high. In some developing countries, although the degree of industrialization and urbanization is not very high, the mortality rate is relatively low, such as 9.3‰ in Thailand, 7.8‰ in Brazil and 6.9‰ in China.

Natural population growth rate = birth rate-mortality rate

There is no standard answer to this. Let's compare it. Africa has the highest mortality rate anyway.