Archives par mot-clé : IPCC

How constant is the “solar constant?”

by Andy May, September 19, 2018 in WUWT

The IPCC lowered their estimate of the impact of solar variability on the Earth’s climate from the already low value of 0.12 W/m2 (Watts per square-meter) given in their fourth report (AR4), to a still lower value of 0.05 W/m2 in the 2013 fifth report (AR5), the new value is illustrated in Figure 1. These are long term values, estimated for the 261-year period 1750-2011 and they apply to the “baseline” of the Schwabe ~11-year solar (or sunspot) cycle, which we will simply call the “solar cycle” in this post. The baseline of the solar cycle is the issue since the peaks are known to vary. The Sun’s output (total solar irradiance or “TSI”) is known to vary at all time scales (Kopp 2016), the question is by how much. The magnitude of short-term changes, less than 11 years, in solar output are known relatively accurately, to better than ±0.1 W/m2. But, the magnitude of solar variability over longer periods of time is poorly understood. Yet, small changes in solar output over long periods of time can affect the Earth’s climate in significant ways (Eddy 1976) and (Eddy 2009).

Empirical Evidence Shows Temperature Increases Before CO2 Increase in ALL Records

by Tim Ball, September 9, 2018 in WUWT

The question is how does the Intergovernmental Panel on Climate Change (IPCC) determine that an increase in atmospheric CO2 causes an increase in global temperature? The answer is they assumed it was the case and confirmed it by increasing CO2 levels in their computer climate models and the temperature went up. Science must overlook the fact that they wrote the computer code that told the computer to increase temperature with a CO2 increase. Science must ask if that sequence is confirmed by empirical evidence? Some scientists did that and found the empirical evidence showed it was not true. Why isn’t this central to all debate about anthropogenic global warming?

BBC tells journalists that IPCC is God, can not be wrong –”No debate allowed”

by JoNova, September 8, 2018

Lets all bow to the IPCC — a modern God that shalt not be questioned. The Holy Sacred Climate Cow!

The IPCC is an unaudited and unaccountable foreign committee. Not only are no scientists paid to check its findings, now the publicly mandated BBC is making sure none of their journalists will check its findings either.

Carbonbrief has a copy of the BBC new internal guidance on how to report climate change.

In April, the UK regulator, Ofcom, found the BBC was guilty of not sufficiently challenging Lord Lawson, a skeptic. So in response the BBC now promises they will never sufficiently challenge the IPCC. That’s “false balance” for you.

Why I Don’t Deny: Confessions of a Climate Skeptic — Part 2

by Kip Hansen, August 27, 2018 in WUWT

Note:  Please read Part 1 before reading this — this is a continuation of that essay (a rather long continuation….).

Readers will have heard the line “multiple lines of evidence” attached to the attribution of anthropogenic causes.  However, that phrase is used only once in AR5 SPM as “Multiple lines of evidence indicate a strong, consistent, almost linear relationship between cumulative CO2 emissions and projected global temperature change to the year 2100….”  I’m sure I don’t need to point out that there is never ever evidence about the future…..They do not claim in the Summary for Policy Makers that there are multiple lines of evidence for the attribution statement that apply to the past-to-present.


IPCC’s Kangaroo Science…To Ignore Over 600 Papers Confirming Major Solar Impact On Climate

by P. Gosselin, July 17, 2018 in NoTricksZone

The upcoming 6th IPCC Sixth Assessment Report will be a “comprehensive assessment of the science” related to climate change and published in 2022. However, don’t expect it to be “comprehensive” at all as hundreds of scientific publications showing profound impacts by sun and oceans will go ignored.

Climate science has turned into a religion that centers on a single act of faith. Human CO2 is changing our climate.

In the past it was always understood that climate was impacted by a vast array of factors, such oceanic cycles, solar cycles, aerosols, cloud cover, etc. to name a few.

Images: NASA (public domain)


by Antero Ollila, April 16 in WUWT


COP21 does not define the scientific basis of the agreement for the warming effects of the anthropogenic emissions, but it refers to a scenario. This scenario has not been defined in the COP21, but it can be found. The scientific resource of United Nations as well as of the COP21 is IPCC. The exact specification of IPCC is (Summary for Policymakers. In: Climate Change 2014. Mitigation of Climate Change”): “Baseline scenarios, those without additional mitigation, result in global mean surface temperature increases in 2100 from 3.7 °C to 4.8 °C compared to pre-industrial levels (range based on median climate response; the range is 2.5 °C to 7.8 °C when including climate uncertainty)”. Even though IPCC refers to multiple scenarios in the text above, the surface temperature increase to the average value of 4.25 ⁰C means one scenario only.

The Climate Dictionary

by Willis Eschenbach, March 16, 2018 in WUWT

Finally, we have the IPCC Likelihood Scale:

Virtually certain – “All my cool scientist friends agree”.

Very likely – “We really hope this is true”.

Likely – “Two climate models out of three agree”.

About as likely as not – “Nobody has a clue”.

Unlikely – “This outcome offends us”.

Very unlikely – “We really don’t want you going down that path”.

Exceptionally unlikely – “Stephen McIntyre said it first so it can’t possibly be true.”


by Jo Moreau, 9 mars 2018, in Belgotopia

Complémentairement à l’article de Donna Laframboise, il semblerait que les différents groupes de travail du GIEC n’aient pas la même définition d’un conflit d’intérêt. On peut identifier deux formes principales de conflit d’intérêt : soit l’utilisation d’une étude rédigée par un auteur ou coauteur du GIEC, ce qui revient à publier des études qu’on utilisera ensuite dans une auto-justification, (voir aussi à ce sujet un billet précédent : ), soit la présence en ses rangs d’un salarié de l’industrie ou d’un membre ou d’un proche d’une ONG militant dans le domaine idéologico-politique.

On se rappelle que des contributeurs du GIEC, salariés de l’industrie chimique, avaient été accusés par diverses sources de conflit d’intérêt en 2016, que dire alors de membres ou proches d’ONG militantes, qui semblent de plus en plus se substituer aux organes démocratiques dans la direction de nos sociétés…

Crucial Climate Verdict, Naked Conflict-of-Interest

by D. Laframboise, January 29, 2018 in BigPicturesNews…

BIG PICTURE: In November 1995, the Intergovernmental Panel on Climate Change (IPCC) declared for the first time that humans were changing the climate. Its verdict turned on a single piece of then-unpublished research. Four months after the fact, the research was submitted to a prominent journal. Three months later it was published.

The world then learned that 25% of the IPCC personnel tasked with making its most crucial determination were involved with this research. In a naked a conflict-of-interest, these nine people, led by IPCC chapter head Ben Santer, had evaluated the persuasiveness of their own fledgling scientific work – and had judged it sound enough to change history.

See also here (in French)

Record 2018 snowfall continues increasing snowfall trends showing UN IPCC AR5 report is flawed

by Larry Hamlin, February 13, 2018 in WUWT

The record snowfalls of 2018 that are sweeping across the Northern Hemisphere and continuing the growth trend in winter snowfall levels provide yet more compelling evidence that the UN IPCC AR5 WG1 climate report and models are flawed because this report concludes that future snowfall level trends will only decline.(…)

Crucial Climate Verdict, Fledgling Evidence

by Donna Laframboise, January 26, 2018 in BigPictureNews

BIG PICTURE: In 1995, a 40-year-old climate modeller named Ben Santer was in charge of Chapter 8 of the UN’s upcoming Intergovernmental Panel on Climate Change (IPCC) report. Nothing in the other 49 chapters mattered more than the question his team was expected to answer: Was global climate change wholly natural – or was it partially caused by human activity?