Sankey diagram showing the projected populations of the most populous countries in 2025, 2050, and 2100. In 2025, India (1.46B) and China (1.41B) have the largest populations. By 2050, India is projected to reach 1.68B and remain the most populous, while China's population is expected to decrease to 1.26B. By 2100, India is projected to have 1.51B, and Nigeria is expected to become the second most populous country with 791M. China's population is projected to further decline to 633M by 2100, ranking below Nigeria and Pakistan (511M). The diagram illustrates the significant shifts in global population rankings over the century.
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