So very many of us
The current world population of 7.3 billion is expected to reach 8.5 billion by 2030, 9.7 billion in 2050 and 11.2 billion in 2100, according to ‘World Population Prospects: The 2015 Revision”, which is compiled and issued by the Department of Economic and Social Affairs of the United Nations.
Of particular interest to us is the prediction (based on very sound estimates and the careful curation of data) that some time in 2022 the population of India will exceed the population of China. Currently, the population of China is approximately 1.38 billion compared with 1.31 billion (the UN-DESA estimate as of now) in India.
By 2022, both countries are expected to have approximately 1.4 billion people. Thereafter, India’s population is projected to continue growing for several decades to 1.5 billion in 2030 and 1.7 billion in 2050, while the population of China is expected to remain fairly constant until the 2030s, after which it is expected to slightly decrease.
China is now a ‘low fertility country’, that is, one in which women have fewer than 2.1 children, on average, over their life-times. Low-fertility countries now include all of Europe and Northern America, plus 20 countries of Asia. India is an ‘intermediate fertility’ country, that is, where women have on average between 2.1 and 5 children. Intermediate-fertility countries are found in many regions, with the largest being India, Indonesia, Pakistan, Bangladesh, Mexico, and the Philippines.
Most of the projected increase in the world’s population can be attributed to a short list of high-fertility countries, mainly in Africa, or countries with already large populations. During 2015-2050, half of the world’s population growth is expected to be concentrated in nine countries: India, Nigeria, Pakistan, D R Congo, Ethiopia, Tanzania, USA, Indonesia and Uganda (listed according to the size of their contribution to the total growth).
Currently, among the ten largest countries in the world, one is in Africa (Nigeria), five are in Asia (Bangladesh, China, India, Indonesia, and Pakistan), two are in Latin America (Brazil and Mexico), one is in Northern America (USA), and one is in Europe (Russia). Of these, Nigeria’s population, currently the seventh largest in the world, is growing the most rapidly. Consequently, the population of Nigeria is projected to surpass that of the USA by about 2050, at which point it would become the third largest country by population in the world.