These are the most fragile cities in the world - and this is what we've learned from them

We are an urban species. Homo urbanis is actively reshaping geopolitics, economics and climate action in the 21st century. And with good reason. While the world’s cities cover just 2% of the earth’s surface, they account for 55% of its population. What’s more, they generate 80% of the world’s GDP and over 90% of its patents. Yet they are also responsible for 75% of all energy consumption and 80% of CO2 emissions. Notwithstanding rising expectations of our cities, a surprising number of them are fragile – posing a threat not just to their residents, but to nations and the global system itself.