As the developing world urbanizes and its slums swell, the number of people affected by natural disasters is increasing.
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The world is experiencing the most abrupt shift in human settlements in history. After decades of rural to urban migration, half of all humanity now lives in cities. By 2050, that figure will surge to 75 percent, with the developing world responsible for most of this increase. Mankind's unprecedented urbanization will create new economic opportunities. But it will also place extraordinary strains on national and municipal authorities struggling to provide the poor inhabitants of these chaotic agglomerations with basic security, sustainable livelihoods, and modern infrastructure.
And when it comes to natural disasters, today's burgeoning urban centers will increasingly be on the front lines.
Statistics on urbanization are staggering. Cities in the developing world are adding five million residents per month--seven thousand each hour, or more than two per second. For perspective, this is the equivalent to adding one city the size of the United Kingdom every year. Between 2010 and 2050, experts predict, Africa's urban population will triple, while Asia's will double. The vast majority of newcomers are poor. Today, some 828 million people live in slums, including more than 60 percent of city-dwellers in sub-Saharan Africa (and 43 percent in South-Central Asia). By 2040, the global number of slum-dwellers will climb to two billion--nearly a quarter of humanity--as the world's shanty-towns, bidonvilles, and favelas add another twenty-five million per year.
From a long-term economic perspective, the shift from rural to urban living can be a boon for national wealth. As a general rule, UN Habitat explains, "The more urbanized a country, the higher the individual incomes."
But the world's rapidly growing cities are increasingly at risk of natural disasters, ranging from catastrophic fires to landslides, massive floods, and tidal waves. This is alarming, given evidence that such events are on the rise. According to the Center for Research on the Epidemiology of Disasters, "the number of people reported affected by natural disasters" rose astronomically between 1900 and 2011, from a few million early in the twentieth century to a peak of 680 million in 2000 (hovering around 300 million today). To be sure, much of this rise is attributable to evolving reporting standards and a growing global population. But alongside these changes has been a growing global awareness of and unwillingness to tolerate the extreme suffering of "natural" disasters.
Moreover, certain types of disasters seem clearly on the rise. Over the last three decades, during which observation techniques have been "fairly comprehensive and consistent," reports of major floods have climbed from an average of less than fifty to just below two hundred per year. Incidences of tropical storms have climbed from around ten to roughly fifteen, and the annual total of U.S. tornadoes and global tsunamis has risen significantly. The financial costs have risen even faster. According to Gerhard Berz, former head of Geo Risks at Munich Re, a German re-insurance corporation, "losses from natural disasters have increased eightfold in economic terms during the last four decades. The insured losses have even increased by a factor of fourteen."