Geoscience Reference
In-Depth Information
Conclusion
In the IPCC's Fifth Assessment report,
Summary for Policymakers
(SPM), there is no
mention at all of tornadoes or hurricanes in the extreme weather events section. They give
low confidence to tropical storm activity being connected to climate change, and don't
mention mesoscale events like tornadoes and thunderstorms at all. Similarly, they give low
confidence to drought and flood attribution.
They've only talked about heat waves and precipitation events being connected. From
the SPM:
Changes in many extreme weather and climate events have been observed since about 1950 … It is very likely that the
number of cold days and nights has decreased and the number of warm days and nights has increased on the global
scale. It is likely that the frequency of heat waves has increased in large parts of Europe, Asia and Australia. There
are likely more land regions where the number of heavy precipitation events has increased than where it has decreased.
The frequency or intensity of heavy precipitation events has likely increased in North America and Europe. In other
continents, confidence in changes in heavy precipitation events is at most
medium
.
8
Thisisconsistentwithwhatwasreportedinthe
IPCC Special Report on Extremes
(SREX).
There is medium evidence and high agreement that long-term trends in normalized losses have not been attributed to
naturaloranthropogenicclimatechange…Thestatementabouttheabsenceoftrendsinimpactsattributabletonaturalor
anthropogenic climate change holds for tropical and extratropical storms and tornados … The absence of an attributable
climate change signal in losses also holds for flood losses.
9
This lack of attribution of severe storms to 'man-made climate change' in AR5 contradicts
the claims of Hurricane Sandy, tornado outbreaks, floods, and other media sensationalisms
about imagined connections with climate change.
In addition to two IPCC reports making no connections between extreme weather and
climate, we have
Nature
's editorial in 2012 saying:
Better models are needed before exceptional events can be reliably linked to global warming …
To make this emerging science of 'climate attribution' fit to inform legal and societal decisions will require enormous
research effort.
10
When the journal
Nature
says that there is no reliable linkage and 'enormous research
effort'isneededtolinkextremeweatherasabyproductofglobalwarming,climatechange,
or climate disruption, you know that no matter what you want to call it, it is a dead issue
with true science at the moment, and the value of such wild claims trying to link extreme
weather with climate exists only as a recruitment tool for climate activists and zealots.
