In addition, over 50% of the world population lives in cities, and megacities represent an environmental challenge (UN World Urbanization Prospects, XXXXXXXXXXBut perhaps one of the most challenging...

In addition, over 50% of the world population lives in cities, and megacities represent an environmental challenge (UN World Urbanization Prospects, 2014). But perhaps one of the most challenging developments in the past decade is the movement of people, that is, immigration from developing countries to the West due to poverty and war that have been caused by continuing political and environmental events.