At least 3 billion people do not have adequate homes, and over 1 billion are living in slums and informal settlements, according to UN-Habitat, which is calling for action in the midst of a "global crisis" in housing.
Most of those suffering reside in Asia and Africa, and the agency is urging decision-makers to recognise that without intervention as many as 3 billion could end up living in slum conditions by 2050 – a threefold jump.
