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Another FACT CHECK 
The World Is Getting Safer From Floods by @WSJOpinion @BjornLomborg https://www.wsj.com/articles/flood-climate-change-ipcc-united-nations-infrastructure-deaths-cost-severe-weather-11631134276?st=mcxc6l2dbskcdij&reflink=desktopwebshare_twitter … via @WSJOpinion
Is this claim by @BjornLomborg in the @WSJ correct?
"the relative toll that floods take on the U.S.—in property and lives—has decreased over time"
Yes it is
Figure below is updated from Downton et al 2005 https://doi.org/10.1061/(ASCE)1527-6988(2005)6:1(13) …
The decline is huge (this data starts 1940)pic.twitter.com/YYUAYO2GzW
In terms of flood deaths in the US death has decreased in term of both Absolute numbers--> https://www.weather.gov/media/hazstat/80years_2020.pdf … And death rates (per capita)--> https://ourworldindata.org/natural-disasters … Similar to most disaster mortality trends
OK, that is the US, what about China? Flood impacts, economic and human both down sharply Du et al 2019 https://nhess.copernicus.org/articles/19/715/2019/ …pic.twitter.com/oXRsV2xZOl
OK, that's the US and China, what about India? Both economic and human impacts down, but not as sharply as in the US and China Sources: https://twitter.com/RogerPielkeJr/status/1419786357992394752?s=20 … and https://twitter.com/RogerPielkeJr/status/1420058055325020170?s=20 …pic.twitter.com/slFcnudVap
Globally? Also down Merz et al 2021 "fatalities & people affected by disastrous river floods increased from the mid-1970s to the mid-1990s & has since decreased from around 150m people affected/yr to 40m people & from ~10,000 fatalities/yr to 4,000"https://www.nature.com/articles/s43017-021-00195-3 …
What does the IPCC say on this? https://www.ipcc.ch/report/ar6/wg1/ Confidence in global trends up or down is low Some places up, some down Same as AR5 But the decrease in impacts (relative economically & absolute for fatalities) is undeniablepic.twitter.com/FKEh0SGkQ4
Bottom line:
@BjornLomborg has accurately conveyed the peer-reviewed literature & IPCC conclusions on flood impacts
More broadly, the US is not an outlier, as similar trends can be found globally on climate time scales
FACT CHECK = 
As a proportion of GDP?!? This only demonstrates that GDP has grown a little faster than flood damage costs. Hardly surprising is it?
GDP is used as proxy for societal wealth If twice number of houses (or twice as big/costly), the same flood will now destroy twice as much You have to correct for that to get impact from disasters This is also position of UN: https://unstats.un.org/sdgs/metadata/?Text=&Goal=11&Target=11.5 …pic.twitter.com/6YSzr2EeSA
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