Lööf, Hans; Nabavi, Pardis - Centre of Excellence for Science and Innovation … - 2012
cities are home to more than 50% of the world population, the largest 600 urban centers generate about 60% of global GDP, and … the agglomerated areas are responsible for 75% of world carbon emissions. The UN estimates that 70% of the world's growing … population will live in cities by 2050. At the same time the world population is expected to increase from 7 billion people to 9 …