PARIS, Aug 4 — The number of people exposed to floods worldwide has surged almost a quarter over the last two decades, according to satellite-based data that shows an additional 86 million now live within flood-prone regions.
Most flood maps rely on modelling based on ground-level observations such as rainfall and elevation, but they can often entirely miss ewgions that are historically not flood-prone. Writing in the journal Nature, the researchers found that up to 86 million people, driven by economic necessity, moved into known flood regions between 2000-2015 — a 24-per cent increase.
“We are able to map floods that are often unmapped or not typically represented in flood models, such as ice melt floods or dam breaks,” said Tellman. Just 1.5 degrees Centigrade of warming — the most ambitious Paris Agreement temperature goal — would see two or three times more people affected by floods in Colombia, Brazil and Argentina, four times more in Ecuador and Uruguay, and a five-fold jump in Peru, the IPCC report said.
“It is well known that spending US$1 on disaster management and prevention can save up to US$6 on relief and recovery efforts,” she said.
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