IPCC still pedaling junk science via its new AR6 report

The UN’s Intergovernmental Panel on Climate Change (IPCC) has just published their sixth “Assessment Report” (AR6). If you suffer from insomnia, you can read the whole thing here: https://www.ipcc.ch/report/ar6/wg1/.

The new AR6 report alleges, among other things that:

“Human-induced climate change is already affecting many weather and climate extremes in every region across the globe. Evidence of observed changes in extremes such as heatwaves, heavy precipitation, droughts, and tropical cyclones, and, in particular, their attribution to human influence, has strengthened since the Fifth Assessment Report (AR5).”

That statement has spawned alarming headlines from the “main-stream media.”

In six major reports since 1990, the IPCC has published thousands of pages of material, none of which provide any physical or observational evidence that our carbon dioxide emissions have a significant effect on global temperature. All their dire predictions are based on scenarios produced by “garbage-in-garbage-out” computer modeling, the results of which all run hotter than physical measurements. See graph below:

Christy models vs observations

The IPCC ignores natural variation in temperature and climate which has been happening for billions of years. By some magic, all temperature variation since about 1850 is due entirely to humans according to the IPCC. In the new report, the IPCC also makes false claims about sea level rise and ocean acidification (see here and here).

Contrary to what the IPCC says, we see that increased CO2 and warming have had no effect on hurricane frequency or intensity.

Hurricane frequency July 2021
Hurricanglobal_ace July 2021
We also see that, not-with-standing the heat-waves in Pacific northwest in 2021, U.S. heat-waves were greater in the 1930s.


Additional Comments:

Heartland Institute Reacts to ‘Alarmist’ UN IPCC Climate Report:

“The new IPCC report, in which the IPCC bureaucracy must strike an alarmist tone in order to justify and perpetuate the bureaucracy’s existence, adds virtually no substantive scientific evidence to the global warming debate. The objective data still show that global temperatures are rising much more slowly than the IPCC previously predicted, and that most extreme weather events and climatological factors are either not being impacted by modest warming or are becoming more benign rather than harmful. IPCC may be ramping up its rhetoric and fear-mongering, but this merely highlights the lack of any new scientific evidence to resuscitate the climate alarmism narrative.”

“Last week, the IPCC admitted the newest climate models they used in their report are flawed, running unrealistically hot. Yet, rather than delaying their report, they released it based on unbelievable inputs. How can the IPCC claim to have ‘high confidence’ that the warming of the past 50, 100, or 150 years is unusual, much less unequivocally caused by humans, when the models used to source the claim don’t track observed temperature data sets from weather balloons or satellites? The answer is, they can’t. This a political, not a scientific document. (Read more)


“The whole aim of practical politics is to keep the populace alarmed (and hence clamorous to be led to safety) by menacing it with an endless series of hobgoblins, all of them imaginary.” — H. L. Mencken (1880-1956)

“The urge to save humanity is almost always a false-front for the urge to rule it.” – H.L. Mencken

For some real science, see my blog posts:

A Review of the state of Climate Science

Carbon dioxide is necessary for life on Earth