AR6: Headline Statements from the Summary for Policymakers

So, If I were a policy maker, this report would concern me ( it does as a layperson, as well).

What say you?

https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Headline_Statements.pdf

A. The Current State of the Climate
A.1 It is unequivocal that human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.
A.2 The scale of recent changes across the climate system as a whole and the present state of many aspects of the climate system are unprecedented over many centuries to many thousands of years.
A.3 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). A.4 Improved knowledge of climate processes, paleoclimate evidence and the response of the climate system to increasing radiative forcing gives a best estimate of equilibrium climate sensitivity of 3°C, with a narrower range compared to AR5. B. Possible Climate Futures B.1 Global surface temperature will continue to increase until at least the mid-century under all emissions scenarios considered. Global warming of 1.5°C and 2°C will be exceeded during the 21st century unless deep reductions in carbon dioxide (CO2) and other greenhouse gas emissions occur in the coming decades. B.2 Many changes in the climate system become larger in direct relation to increasing global warming. They include increases in the frequency and intensity of hot extremes, marine heatwaves, and heavy precipitation, agricultural and ecological droughts in some regions, and proportion of intense tropical cyclones, as well as reductions in Arctic sea ice, snow cover and permafrost. B.3 Continued global warming is projected to further intensify the global water cycle, including its variability, global monsoon precipitation and the severity of wet and dry events. B.4 Under scenarios with increasing CO2 emissions, the ocean and land carbon sinks are projected to be less effective at slowing the accumulation of CO2 in the atmosphere. B.5 Many changes due to past and future greenhouse gas emissions are irreversible for centuries to millennia, especially changes in the ocean, ice sheets and global sea level.

 

I'd say the authors have tied themselves up in some serious knots they won't easily get out of.
Pielke Jr. on AR6
Guest Blogger
So IPCC recognizes that 8.5 scenarios have “low likelihood” but nonetheless choose to remain “neutral” with respect to scenario assumptions . . . .

 

The deconstruction is under way.
IPCC Enters “Into Thin Air”. German Scientists: IPCC “In A Hopeless Situation”…”Stained Scientists”
By P Gosselin on 10. August 2021

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IPCC’s sixth climate report disappoints across the board
By Die kalte Sonne
(Translated, headings by P. Gosselin)

The IPCC’s 6th Assessment Report on Climate (AR6) was published yesterday, August 9, 2021. Fritz Vahrenholt has summarized the most important things on Roland Tichys Einblick. . . . .

 

The debate has begun.
Challenging UN, Study Finds Sun—not CO2—May Be Behind Global Warming
Eric Worrall
Climate scientist Dr. Ronan Connolly, Dr. Willie Soon and 21 other scientists claim the conclusions of the latest “code red” IPCC climate report are strongly dependent on the authors’ narrow…

 

Consensus climatology gets it wrong regularly.

The IPCC’s attribution methodology is fundamentally flawed
Posted on August 18, 2021 by curryja | 4 comments
by Ross McKitrick

One day after the IPCC released the AR6 I published a paper in Climate Dynamics showing that their “Optimal Fingerprinting” methodology on which they have long relied for attributing climate change to greenhouse gases is seriously flawed and its results are unreliable and largely meaningless. Some of the errors would be obvious to anyone trained in regression analysis, and the fact that they went unnoticed for 20 years despite the method being so heavily used does not reflect well on climatology as an empirical discipline.

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The IPCC has been dumbing down the question.

15 minutes
Posted on September 3, 2021 by curryja | 160 comments
by Judith Curry

In a recent invited talk at the American Chemical Society annual meeting, I attempted to explain the climate debate in 15 minutes.

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". . . In my talk today, I’m going to present you with a different perspective on the climate change problem and how we can approach solutions.

So what’s wrong with the crisis narrative? It is my assessment that

• We’ve vastly oversimplified both the problem and its solutions
• The complexity and uncertainty surrounding climate change is being kept away from the public and policy debates.
• Rapid reductions in emissions are technologically and politically infeasible on a global scale
• And it overemphasizes the role of climate change in societal problems, distracting from real solutions to them. . . . "