As the world urbanizes rapidly, [[tweetable]]international experience has shown that economic activities concentrate in a relatively small number of places[[/tweetable]] – it is estimated that…

Sameh Wahba, Judy Zheng Jia |

This page in: Arabic | Français | 中文 In a world divided over how to deal with such serious problems as terrorism, immigration, free trade, and climate change, governments agree on the urgency of…

Luis Triveno, Michael J. Lea |