Sunday, April 6, 2025

Modern human civilization farming stable Holocene Era now over: The Wheelchair Graph Anthropocene Era

 

https://climateemergencydeclaration.org/wp-content/uploads/2018/09/DontMentionTheEmergency2018.pdf 

 Average global temperature from 20,000
BC. Based on a graph by Jos Hagalaars
(2013) drawing on data from a number
of scientific papers.

https://ourchangingclimate.wordpress.com/2013/03/19/the-two-epochs-of-marcott/ 

 https://www.realclimate.org/index.php/archives/2013/03/response-by-marcott-et-al/

 

 https://tamino.wordpress.com/2013/03/22/global-temperature-change-the-big-picture/

Fascinating! There was a lot of disinfo about this graph - I did a blog post on it a couple years ago.

https://ourchangingclimate.wordpress.com/2013/03/19/the-two-epochs-of-marcott/ 

Now I don't feel so bad having taken a lot of time investigating the lies about this graph.

https://www.science.org/doi/10.1126/science.1228026 

 that's the study that the graph is based on.

https://www.scienceintheclassroom.org/sites/default/files/research-papers/science-2013-marcott-1198-201.pdf 

 Marcott, S. A., Shakun, J. D., Clark, P. U., & Mix, A. C. (2013). A Reconstruction of Regional and Global Temperature for the Past 11,300 Years. Science, 339(6124), 1198–1201. doi:10.1126/science.1228026

 Globally Resolved Surface Temperatures Since The Last Glacial Maximum" Matthew B. Osman, Jessica E. Tierney, Jiang Zhu, Robert Tardif, Gregory J. Hakim, Jonathan King & Christopher J. Poulsen published November 10, 2021 Nature volume 599, pages 239–244 (2021) -----------

Analysis of global mean surface temperature (GMST) the last 24,000 years by combining several hundred previous published paleo analysis from all over Earth, took 7 scientists 7 years to do the work of combining hundreds of previous published paleo analysis and filling in the areas of Earth between the analyses using advanced statistical methods, and calculating the uncertainty in those statistical methods for the infill. 
"Climate changes across the last 24,000 years provide key insights into Earth system responses to external forcing. Climate model simulations and proxy data have independently allowed for study of this crucial interval; however, they have at times yielded disparate conclusions. Here, we leverage both types of information using paleoclimate data assimilation to produce the first observationally constrained, full-field reanalysis of surface temperature change spanning the Last Glacial Maximum to present. 
We demonstrate that temperature variability across the last 24 kyr was linked to two modes: radiative forcing from ice sheets and greenhouse gases; and a superposition of changes in thermohaline circulation and seasonal insolation. 
In contrast with previous proxy-based reconstructions our reanalysis results show that global mean temperatures warmed between the early and middle Holocene and were stable thereafter. When compared with recent temperature changes, our reanalysis indicates that both the rate and magnitude of modern observed warming are unprecedented relative to the changes of the last 24 kyr".
Time to grow up people - industrial CO2 induced abrupt global warming was first analyzed in detail in 1890 by Svante Arrhenius! Current CO2 levels are already well above anything in the past 3 million years! There's already over 400 Zettajoules of EXTRA heat in the oceans accumulated since 1995. The Arctic will soon be ice-free with 1200 gigatons of pressurized methane hydrates being released as an "abrupt eruption" - just a 5 gigaton release will double global warming temperatures on Earth.
 

 A recent study1 analyzing a global database of paleoclimate records found that no previous warm or cool period in the last 2,000 years—including the Roman Warm Period and the Medieval Warm Period (also called the Medieval Climate Anomaly)—occurred globally and synchronously.

 https://www.researchgate.net/profile/Ellie-Broadman/publication/368550337_Revisiting_the_Holocene_global_temperature_conundrum/links/649816e1b9ed6874a5d7cb84/Revisiting-the-Holocene-global-temperature-conundrum.pdf

So they want better precision still as of 2023

 https://www.sciencedirect.com/science/article/pii/S0921818124002157

  Interglacial conditions are likely to persist for at least 50,000 years under already-accumulated CO2 emissions and Earth's low eccentricity orbit. Continued increases in greenhouse gas emissions are likely to extend that persistence to around 500,000 years, suppressing the pronounced expression of Milankovitch cyclicity typical of the later Pleistocene Epoch. This major perturbation alone is sufficient to justify the Anthropocene as terminating the Holocene Epoch.

 However, a more recent evaluation by the International Energy Agency demonstrated that methane may be responsible for as much as 30 % of global warming since 1900, 60 % of that contribution being anthropogenic; these figures include much data that have previously been under-reported (IEA, 2023).

 Half the world's population experienced extreme heat last year

 https://climatewest.ca/wp-content/uploads/2023/05/Danny-Blair.pdf

 https://prairieclimatecentre.ca/

 

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