Editing Megacity (section)

===Slums===
[[File:Mumbai (5356346073).jpg|thumb|[[Mumbai]]'s [[Dharavi]] slum is home to 1 million residents]]
According to the United Nations, the proportion of urban dwellers living in [[slum]]s or informal settlements decreased from 47 percent to 37 percent in the [[developing world]] between 1990 and 2005.<ref>{{cite web|url=http://www.un.org/millenniumgoals/pdf/mdg2007.pdf |title=p. 26 |access-date=2010-09-01}}</ref> However, due to rising population, the absolute number of slum dwellers is rising and passed 1 billion in 2018.<ref>{{cite web | url=https://unstats.un.org/sdgs/report/2019/goal-11/ | title=— SDG Indicators }}</ref> The increase in informal settlement population has been caused by massive migration, both internal and transnational, into cities, which has caused growth rates of urban populations and spatial concentrations not seen before in history.{{Citation needed|date=May 2014}} The majority of these are located in informal settlements which often lack sufficient quality housing, sanitation, drainage, water access, and officially recognized addresses. These issues raise problems in the political, social, and economic arenas.<ref>{{cite web | url=https://www.weforum.org/stories/2023/08/informal-settlements-are-growing-heres-how-we-provide-everyone-a/ | title=Informal settlements are growing everywhere — here's what we do }}</ref> People who live in slums or informal settlements often have minimal or no access to education, healthcare, or the urban economy.