Sustainable Megacities

Modern urban centers around the world now have neighborhoods that house well over 100,000 people per square mile. The Choa Chu Kang district in Singapore, defined by boulevards lined with 10 to 12 story mid-rise residential buildings, has a population density of more than 125,000 people per square mile. The entire borough of Manhattan has an average population density of more than 70,000 people per square mile, with far higher densities in areas of midtown and lower Manhattan.

According to a 2018 report released by the United Nations, today 55 percent of the world’s population lives in urban areas, a proportion that is estimated to increase to 68 percent by 2050. At the same time, the United Nations projects the global population to increase from 7.8 billion today to 9.7 billion by 2050. These projections lead to a surprising calculation: the absolute number of people living in rural areas is expected to decline, from 3.5 billion today to only 3.1 billion in 2050.

What should not be surprising by now is that people around the world, voluntarily and inexorably, are migrating from rural areas to cities. But the corollary effect is relatively unheralded; that around the world, open land is slowly depopulating. For the most part, this is happening absent government coercion. It flies in the face of the conventional wisdom—heard endlessly in the United States—that we are running out of open space. We aren’t.

If we have a sustainability challenge, it is not […] Read More