Population problems are different in different parts of the world. For example, in many European countries, the population is getting older. The birth rate is low because many young people have only one child or none at all. After retirement, they feel lonely and often very poor because they don’t save enough money.

In Africa, the population problems are very different. The population has grown rapidly over the last 40 years and it has a relatively young population. Many families continue to have large numbers of children to look after older people and to help on the land.

Asia is the largest and most populous of earth’s continents. It also has the highest population growth rate today, and its population almost quadrupled during the 20th century. Asian population will continue to grow, increasing pressure on the region’s natural resources.