According to UN data (https://population.un.org/wup/DataQuery/), the world population will reach 9.7 billion (9.7 × 109) by the end of 2050. It's presumed that almost 70% of that population will be an urban population with many cities having over 10 million inhabitants. It's a significant number and, as the number grows, not only are we presented with new opportunities, but we also face many unique challenges:
Predicted world population (data from UN)
The most difficult challenge is making resources and energy available to all of the inhabitants and, at the same time, avoiding environment deterioration. At present, cities consume 75% of the world's resources and energy and generate 80% of greenhouse gases; while there's a trend towards green energy sources, we all understand that the earth's resources, such as food and water, are limited. Another critical challenge is administration and management; with the growing population, strategies will be needed to prevent...