Title：World Population Day: India will overtake China in 2023, says the UN

From https://www.bbc.com/news/science-environment-62126413

India is set to become the world's most populous country next year, overtaking China with its 1.4 billion people, according to UN figures. Chinese population has been lower every year. The reason why Chinese population is being lower is that young people don’t be willing to born new babies. Although government allowed to born more babies, some people may not afford the expense of a baby. On the contrast, India is in its population profit period. But their environment afford a lot.

So, there are a lot of problems to have too much or too little population. To maintain the population in a suitable range is important.