While cities are often sites of economic and cultural innovation and opportunity - hence their attractive power and growth - they also pose huge challenges - including the difficulties of containing contagious diseases (as we are seeing with COVID-19), transport across their often congested streets, the social sustainability of their ever changing, sometimes conflicting and often vastly unequal (in wealth, power, resources) populations, and environmental sustainability in the context of climate change: as so many large cities - from Rotterdam to Dakar - are situated in low lying delta regions. Not only are more people living in cities, but cities are growing ever larger the number of cities with more than 10 million inhabitants - `megacities` - is set to grow from 33 in 2018 to 43 by 2030 (UN, 2018). ![]() ![]() ![]() Demographers estimate that in 2009 we passed a global tipping point: for the first time in human history more people lived in cities than in rural areas, a trend that has since accelerated and is projected to continue, so that by 2050 70% of the world`s population will live in cities.
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