The United Nations estimates the world population will reach 8 billion people on Tuesday, with the highest growth taking place in India and African nations.

The world population has increased by about 1 billion people in the past 12 years due to longer average life expectancies and declining mortality rates for mothers and children.

The UN says some South Asian countries and Africa will likely continue to see substantial increases in population.

India is projected to surpass China as the world's most populous country in 2023.

Countries in sub-Saharan Africa are expected to account for more than half of the global population increase anticipated through 2050.

The global population is projected to peak at around 10.4 billion people in the 2080s and then decline.

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