Related to this growth in cities is another overarching problem. That is, the extraordinary
global human population growth that has been skyrocketing since humans formed societies,
communities, and ultimately formed cities, beginning 10,000-12,000 years ago, with
accelerated growth coinciding with the industrial revolution, that will likely reach a
population of around how many people by the end of the century (the year 2100)?
billion. The big question is whether or not this is sustainable.