The UN's list of climate-change tricks continues to grow with news this week from the World Climate Report. It accuses the UN Intergovernmental Panel on Climate Change (IPCC) of predicting exaggerated risks of extreme weather attributed to anthropogenic global warming (AGW).

In its 2007 Fourth Assessment Report (AR4), IPCC made the claim that "intense precipitation events" have been increasing in severity across more than half of the globe since 1950. It based the finding on a method called the fixed bin approach, which categorizes average daily rainfall into ranges or "bins" (e.g., one-half to one inch, one to two inches, or more than two inches) and ranks these bins as a percentile of all precipitation events.

However, when used to determine trends in annual precipitation, the fixed bin method can produce false results indicating extremely severe storms that were not actually so harsh. Long before AR4's publication, researchers with the University of Virginia, the University of Colorado, the Cato Institute, and New Hope Environmental Services exposed fixed bin flaws in the 2004 International Journal of Climatology.

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