A man ferries three school children on a bike in New Delhi, India on November 15, 2022. The world's total population hits 8 billion today, according to UN estimates. After China, India is currently the world's second most populous country, with about 1.4 billion people. After adding the most millions over a century, India and China will lead in global population decline by 2100.
Image: Amarjeet Kumar Singh/Anadolu Agency via Getty Images