Living space: how will we live in the future?

Humanity is growing incessantly – there are almost 10,000 new additions to the human race every hour. Today, we have already reached seven and a half billion. Of these, more than half already live in cities, thus making living space more scarce – and more expensive. The UN estimates that the world’s population will grow by a further third by the year 2050. But where and how are all of these people to live?
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