If you want an example of the sort of scientific exaggeration that should concern both scientists and advocates involved in the climate debate (but typically goes uncorrected), next week’s Newsweek magazine has an article on the growing tab of disaster losses, which it attributes to global warming.

Around the country, [insurance] companies have been racking up record property losses from freakish weather, such as the ice storms last week that paralyzed much of the Great Plains and froze California’s citrus crops. In recent years, wildfires in the Northwest, drought and hail in the Midwest, windstorms, lightning strikes on power grids, soil subsidence and other calamities of nature have led to cumulative property losses that exceed those caused by hurricanes. “There’s a shift going on to more frequent, extreme weather events,” says Evan Mills, an environmental scientist at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory. “It’s as much an issue in the heartland as on the coast.”

Global warming is the culprit, claim many—including several insurers who are canceling policies. While scientists cannot determine whether a single weather event is caused by a natural cycle, or is evidence of more permanent, malignant climate change, the pattern of mounting losses is clear. According to Mills, weather-related catastrophe losses have increased from about $1 billion a year in the 1970s to an average of $17 billion a year over the past decade. In 2005, the year of Katrina, that figure reached $71 billion.

We have interacted with Evan Mills before, and despite having his work throughly debunked and the existence of an expert workshop report on the topic cosponsored by Munich Re, he continues to fundamentally misrepresent the state of the science to suggest that comparing disaster losses unadjusted for societal change from the 1970s to the present says something about global warming. It does not. Here are relevant conclusions from our 2006 workshop:

Analyses of long-term records of disaster losses indicate that societal change and economic development are the principal factors responsible for the documented increasing losses to date.

Because of issues related to data quality, the stochastic nature of extreme event impacts, length of time series, and various societal factors present in the disaster loss record, it is still not possible to determine the portion of the increase in damages that might be attributed to climate change due to GHG emissions.

In the near future the quantitative link (attribution) of trends in storm and flood losses to climate changes related to GHG emissions is unlikely to be answered unequivocally.