United Nations expects 6.3 billion people or 68% of the world’s population to be living in urban areas by 2050, with the highest increase occurring in high growth markets. Many of these cities are located on the coast and are threatened by floods, storms, earthquakes and other natural hazards, according to Swiss Re, a reinsurance company. Swiss Re counts residents threatened by multiple perils more than once in the report. Therefore the number of people potentially affected by multiple perils can be more than the size of a city’s population. Shanghai ranks number 8, as in Shanghai, nearly 17 million could be affected by a massive flood, according to Swiss Re. Pearl River Delta, ranks number 3, which includes Hong Kong, Shenzhen, Dongguan, Macau and Guangzhou. More than 34 million people face multiple threats, including storm surge, cyclonic wind damage and river flood in Pearl River Delta.