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Informal settlements
The growth of informal settlements, slums and poor residential neighbourhoods is a global phenomenon accompanying the growth of urban populations. An estimated 25% of the world’s urban population live in informal settlements, with 213 million informal settlement residents added to the global population since 1990 (UN-Habitat, 2013b: 126–8). Informal settlements are residential areas where (UN-Habitat, 2015b; NAME_1, 2015):

inhabitants often have no security of tenure for the land or dwellings they inhabit ‒ for example, they may squat or rent informally;
neighbourhoods usually lack basic services and city infrastructure;
housing may not comply with planning and building regulations, and is often situated in geographically and environmentally sensitive areas (see Topic Guide on Provision and Improvement of Housing for the Poor, NAME_2, 2013).
A number of interrelated factors have driven the emergence of informal settlements: population growth; rural-urban migration; lack of affordable housing; weak governance (particularly in policy, planning and urban management); economic vulnerability and low-paid work; marginalisation; and displacement caused by conflict, natural disasters and climate change (UN-Habitat, 2015b).

Many governments refuse to acknowledge the existence of informal settlements, which undermines city-wide sustainable development and prosperity. These settlements continue to be geographically, economically, socially and politically disengaged from wider urban systems and excluded from urban opportunities and decision-making (UN-Habitat, 2015f). City government attitudes to informal settlements range from opposition and eviction to reluctant tolerance and support for legalisation and upgrading. Upgrading informal settlements, through tenure regularisation and provision of infrastructure, is widely accepted as preferable to relocation (Devas et al., 2004), helping to sustain social and economic networks considered vital for livelihoods.

Living in informal settlements disproportionately affects certain groups. Informal settlements often sit on the periphery of urban areas, lacking access to markets and/or resources. For women, for example, this can heighten barriers they face in accessing livelihood opportunities. Home-based workers also face challenges to entrepreneurial activity (NAME_3, 2014). Women in informal settlements spend more time and energy accessing basic services than other urban counterparts, limiting their ability and time to earn through pai Please answer in JSON format.
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