Least developed country (LDC) is the name given to a country which according to the United Nations fits within the broader grouping of less-developed countries (see below) and as such, exhibits the lowest indicators of socioeconomic development.Read more..
These comprise all regions of Africa, Asia, Latin America and the Caribbean plus Melanesia, Micronesia and Polynesia
Mega cities is a term used when the population in a city is more than 10 million people. At the outset of the twentieth century, 10% of the population lived in cities. Later in 2000 around 50% of the world population lives in cities. Read more..