The headlines are the stuff of biblical plagues: Expect More Droughts, Heavy Downpours, Excessive Heat, And Intense Hurricanes Due To Global Warming, NOAA
The U.S. Climate Change Science Program and the Subcommittee on Global Change Research has released a scientific assessment that provides the first comprehensive analysis of observed and projected changes in weather and climate extremes in North America and U.S. territories. Among the major findings reported in this assessment are that droughts, heavy downpours, excessive heat, and intense hurricanes are likely to become more commonplace as humans continue to increase the atmospheric concentrations of heat-trapping greenhouse gases.
I've said it once, I'll say it again; Ohmygod…we are all going to die!
Or not.
The thing is, wasn't Anthropogenic Global Warming (TM) supposed to be an ongoing process were are now caught in the middle of, and not some theoretical possibility in a far off future? If that is true we should have seen some evidence of these increases in extreme weather. Well, what is the evidence in the report for that? Turns out there isn't any, as Roger Pielke has helpfully outlined:
The report contains several remarkable conclusions, that somehow did not seem to make it into the official press release.
1. Over the long-term U.S. hurricane landfalls have been declining.
2. Nationwide there have been no long-term increases in drought.
3. Despite increases in some measures of precipitation (pp. 46-50, pp. 130-131), there have not been corresponding increases in peak streamflows (high flows above 90th percentile).
4. There have been no observed changes in the occurrence of tornadoes or thunderstorms
5. There have been no long-term increases in strong East Coast winter storms (ECWS), called Nor’easters.
6. There are no long-term trends in either heat waves or cold spells, though there are trends within shorter time periods in the overall record.
(Pielke has extended commentary on each of these findings, and you should head over to Prometheus to read it all.)
So what scientific evidence do we have that Global Warming is leading to extreme weather events? Well, we don't have any, not in the sense of actual observed weather events. Shouldn't that give someone pause? Normal people probably would taken aback by the lack of evidence. But we are not dealing with normal people.
"Well the things is," we are told, "we scientists have these absolutely fabulous computer models which predict future extreme weather events."
How do you know they are accurate? Have you used them to replicate the known incidences of extreme weather of the past?
"Well, no, we haven't been able to do that exactly. But we are totally confident we can predict the future."
Why is that?
"Because theses are computer models. You can't argue with computers! They are, like, totally high-tech."
The amazing thing is, the press is largely swayed by this argument. The complete lack of evidence doesn't bother them in the least. We generally have names for things people believe despite the absence of supporting evidence. "Science" isn't one of the names.