The population of the planet is still increasing, but more slowly. The slowing growth is mostly caused by declining fertility rates in an increasing number of nations. The future patterns of populations do, however, vary significantly between areas and nations, with sub-Saharan African nations expected to experience the majority of the population growth. In many nations and regions where fertility is changing quickly, population momentum is a key factor in predicting future population increase. The world's population is ageing at an unprecedented rate due to fertility reductions, and the proportion of smaller-sized households is increasing. Since the turn of the century, there has been an increase in international migration as well. Due to a rise in internal rural to urban migration, the world's population is likewise becoming more urbanised.
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