The question of where to draw the line between what is and what is not a city is getting harder to answer. As the world moves towards total urbanisation, settlements are spreading out by merging into one another to create what urban experts term “megalopolises”.
The world’s population reached 8 billion Tuesday, according to estimates from the United Nations, even as the international body said that a surge in births in lower income countries is likely to create risks.
The United Nations said the global milestone signals major improvements in public health that have lowered the risk of death and increased life expectancy.