In the year 2100 the world will be 8.8 billion people, 2 billion less than the current UN projections, according published on Wednesday the large study group of international scientists, in which these findings are due to a decline in fertility, population aging, problems of malnutrition in some countries.

By the end of the century in 183 out of 195 countries, with the exception of the influx of immigrants, growth will fall below the threshold of replacement necessary to maintain the population, said an international group of researchers in the Lancet. More than twenty countries, including Japan, Spain, Italy, Thailand, Portugal, South Korea and Poland, the population will be reduced by at least half. Interestingly, in China, according to analysts, the number of inhabitants will decrease from the current 1.4 billion people to 730 million over 80 years. At the same time in the countries of Africa South of the Sahara, the population may increase by three times to approximately 3 billion people in one of Nigeria by the year 2100 will live almost 800 million people. It will occupy second place in the world, second only to India with 1.1 billion inhabitants. The rapid population growth in poor countries will only exacerbate their economic problems, in particular, African and Asian countries will inevitably face a large-scale workforce reduction.

According to lead study author Christopher Murray of the University of Washington, these projections show good news for the environment, less burdensome on the systems of food production and lower carbon emissions, as well as significant economic opportunities for some parts of Africa, situated South of the Sahara. According to the opinion of scientists, for countries with high income the best solutions to maintain the level of population and economic growth can become a flexible immigration policy and social support to families who want children.