Currently, every seventh person worldwide lives in an informal urban settlement, summing up to 850 million people globally. In some megacities of low- and middle-income countries almost 80% of the total population lives in slums. Fast urbanization is observed worldwide but in developing countries it is expected adding up to 1.5 billion in 2025 people living in slums. Three-quarter of the world’s population is expected to live in an urban environment by 2050, whereby urbanization in developing countries will be the most significant. These facts illustrate that immediate action is required and this issue cannot be neglected, since slums will not be resolved but in fact increasing over the coming years. Based on the UN Millennium Goal Number 7 (directly 7D) on the improvement of slum dweller living conditions, several UN post-2015 Sustainable Development Goals (SDGs) are also trying to address this complex issue.
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