Water, Megacities and global change: portraits of 15 emblematic cities of the world

Water, Megacities and global change: portraits of 15 emblematic cities of the world

Numerous studies have explored urban growth and the emergence of the megapolitan phenomenon through increasing growth in the number of cities with over 10 million inhabitants. Similarly, the processes of climate change are also the subject of study from various perspectives as part of more operational approaches or research. Rather, the objective here is to highlight the impacts of those global changes (urban growth and climate) on megacities, their resources, and their water and sanitation services. What emerges is a singular vulnerability: megacities concentrate populations, services and goods. This amplifies the consequences of water-related risks (e.g. largescale floods, lack of resources, environmental pollution and other challenges).

This overview of 15 emblematic cities calls for general mobilisation to devise the sustainable urban policies the world needs. All these urban centres share a number of common characteristics: expansive size, disparities between rich and poor districts, environmental and industrial demand that strains the natural resources of an entire region – not to mention the economic weight of the country as a whole – and a wide range of cultural, scientific and educational resources.

Cities included:

  • Beijing
  • Buenos Aires
  • Chicago
  • Ho Chi Minh City
  • Istanbul, Lagos
  • London
  • Los Angeles
  • Manila
  • Mexico City
  • Mumbai
  • New York
  • Paris
  • Seoul
  • Tokyo
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