Over a billion people live in slums, an increase of more than a hundred million over twenty years.
This is mainly in Asia and Africa, with unplanned urban growth meaning that people often build their own poor-quality unsanitary homes. In south Asia and sub-Saharan Africa, around half of city-dwellers live in slums.
The real reason, though, is the massive inequality that marks this capitalist world, with so many having their lives disrupted and being forced to move to cities. Whether this is a result of war, climate change, economic problems or other causes, it shows clearly that the present global system cannot satisfy even the basic demands of much of the population.
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