This is the summer of flooding across the US, and scientists know why (CNN 2025-07-20)
Fossil fuel pollution — alongside other compounding factors — has transformed these months into a time of mounting peril, punctuated by relentless heat waves, rampant wildfires and catastrophic flooding.
“These events are of course much more frequent *because* of human-caused warming,” [climate scientist Michael Mann of the University of Pennsylvania] said in an email.
there is absolutely no doubt that climate change, caused by human emissions of greenhouse gases, is making extreme rainfall more extreme.
Mann is the author of the infamous and debunked "hockey stick" study purporting to show that tree rings showed a dramatic increase in temperatures in the late 20th century. He excluded tree rings that didn't fit his hypothesis and applied a statistical method that produced a hockey stick even from random noise. His analytical techniques haven't improved.
Meanwhile the latest Intergovernmental Panel on Climate Change (IPCC) report tells us:
The SREX (Seneviratne et al., 2012) assessed low confidence for observed changes in the magnitude or frequency of floods at the global scale. This assessment was confirmed by AR5 (Hartmann et al., 2013). The SR1.5 (Hoegh-Guldberg et al., 2018) found increases in flood frequency and extreme streamflow in some regions, but decreases in other regions.
See section 11.5.2 Observed Trends in Chapter 11: Weather and Climate Extreme Events in a Changing Climate. Most of the contributers to the IPCC reports are biased toward the hypothesis that human CO2 emissions are the primary cause of climate change. They rely almost solely on computer models to support their hypothesis but if you take the time to dig through the observations chapters—measurements of climate and weather—the data generally contradict their model-based hypothesis. I suppose they don't notice the irony that the measured data refutes their computer-generated predictions.
This report in the Journal of Hydrology from July 2017 finds no increase in frequency or magnitude of floods and the U.S. National Oceanic and Atmospheric Administration (NOAA) data for Texas shows no increase in the number of floods over time.
It doesn't seem to occur to the prognosticators of climate doom that their predictions are contradictory and the contradictions make them look silly; for example "relentless heat waves, rampant wildfires and catastrophic flooding." In other words, they predict more droughts and more rainfall. All caused by humans. Go figure.
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