Before 1950, most of the largest cities were found in the developed world – for example ... world cities – for example Sao Paulo, Mexico City and Mumbai. This growth is expected to continue ...

Miami's rain carries much more than just droplets of water. Researchers from Florida International University (FIU) have revealed that the rainwater in this region contains "forever chemicals," or ...

In developed countries, cities have tried to manage this problem by introducing traffic management schemes.