How and where will 10 billion people live on Earth?

“We live in the century of the city. In 2008, humanity crossed a milestone as it marked the first time that more people lived in urban areas than any other type of settlement. The United Nations forecasts that most of the global population growth in the coming decades will occur in urban areas. World population is expected to increase by 1 billion to 5 billion between 2007 and 2050 (UN, 2009),1 yielding a global total of between 7.9 and 12 billion people by 2050 depending on fertility and mortality trends (Figure 4.1).2 Under the medium-growth scenario, world population will be almost 10 billion by 2050, with an estimated 3.1 billion new urban dwellers.3” (NRC 2010, p.49)



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