Is this cause for celebration? It is World Population Day. Experts are divided on whether humanity’s survival requires more or fewer people.
Earth population may be ‘billions bigger’
Peak people?: The world's population expanded rapidly in the second half of the 20th Century — and may actually be larger than we think. Glossary
United Nations - An international organisation focused on keeping peace. Its refugee agency, the UNHCR, aims to assist refugees around the world.
Census - An official count of the number of people in a country. In England and Wales, a census takes place every decade.
Fertility - The ability to have a child.
Famine - A widespread scarcity of food.