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Paleoclimate

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In the last 10,000 years, was climate fairly stable until the advent of increased carbon dioxide in the atmosphere post industrialization? Or was there considerable variability in climate with temperatures higher than those measured today?

There is considerable evidence for the Medieval Warm Period and other periods of warmer temperatures. An argument can be made that our current warming is a continuation of the warming that began at the end of the Little Ice Age. Check the resources in this section for more... Study: climate was more variable during the last inter-glacial period. Does climate vary more from century to century when it is warmer? Century-scale climate variability was enhanced when the Earth was warmer during the Last Interglacial period (129-116 thousand years ago) compared to the current interglacial (the last 11,700 years), according to a new UCL-led study.

The findings, published today in Nature Communications and funded by the Natural Environment Research Council (NERC) and the Australian Research Council (ARC), reveal that the Last Interglacial period was punctuated by a series of century-scale arid events in southern Europe and cold water-mass expansions in the North Atlantic. Assessing natural climate variability under relatively warm conditions is crucial to inform projections under future carbon emission scenarios.

Professor Chronis Tzedakis (UCL Geography), study lead author, said: “The Last Interglacial is particularly relevant because it provides insights into climate processes during a period of excess warmth.” Abstract Like this:

Medieval Warm Period (MWP)

Little Ice Age (LIA) and Other Mini-Ice-Ages. The Roman Warm Period. Holocene Thermal Optimum. The Hockey Sticks. Paleoclimate Page | Watts Up With That? 472 Years – CET Extended Graph – Tony Brown – Graph Background Tony Brown – Climate Etc. – Click the pic to view at source 600 Years Arctic Temperature – Overpeck et al. 1997 NOAA NCDC – Click the pic to view at source 1,100 Years – Ljungqvist et al CO2Science.Org – Click the pic to view at source 1,100 Years Ljungqvist et al JoNova.com – Click the pic to view at source 1,100 Years Kirby Kirkby 2007 Harvard – Kirby – Click the pic to view at source 1,100 Years – Lamb – IPCC Assessment Report 1 – Graph Background JoNova – IPCC AR1 – Click the pic to view at source 1,205 Years – M.L.

BioCab.org – Click the pic to view at source 2,000 Years – “Loehle and McCulloch 2008 Graph Background Craig Loehle, Ph.D. and J. 2,000 Years – J. J. 2,000 Years Christiansen 2,100 Years – Law Dome O18 Climate Audit – Law Dome – Click the pic to view at source 2,500 Years – GISP2 – Alley, 2000 Photobucket.com – Click the pic to view at source 3,000 Years – GISP2 – Alley, 2000, Moberg, Keigwin & HadCRUT3 10,000 Years – Vostok E. Eemian and Holocene Climates. Hansen is publishing a new paper in support of the children suing the government for not fighting climate change. In it he claims temps now are higher than the Holocene and matching the Eemian, so we should expect comparable sea levels. Paper is here: Abstract. Global temperature is a fundamental climate metric highly correlated with sea level, which implies that keeping shorelines near their present location requires keeping global temperature within or close to its preindustrial Holocene range.

The image at the top shows that the Eemian climate was very different due to orbital mechanics, which were nothing like today. In addition, Hansen et al. appear to have erased not only the Medieval Warming period, but also the Roman and Minoan periods before them. Hansen et al. are going over the top, exaggerating even beyond IPCC in order to proclaim Waterworld is at hand. Like this: Like Loading... Effect of Atmospheric CO2 Concentrations on Early Human Societies | Watts Up With That? Guest essay by Don Healy Agriculture in ancient Egypt. Their main crops were wheat, barley and ’emmer’ wheat. Source: wall mural During the past 100,000 years, human societies have witnessed the vast change in climate that has occurred as we have transitioned from a glacial period that ended about 20,000 years ago, into the current interglacial period.

During the early stages of this period, human lived as hunter/gatherers, relying on a diet that was very heavily weighted towards meat from a wide variety of wild animals, but also included eggs, nuts, fruits and grasses, to the past 10,000 years or less, when agriculture became a much more dominate feature in society and allowed human populations to remain in the one area and create towns and small hamlets.

As the agricultural model was perfected, much larger town and cities were created, society became more complex and the overall standard of living increased. From : A beneficial climate change hypothesis | Climate Etc. By Rud Istvan A novel hypothesis on the role of CO2 in the technological transition from hunter/gatherers to sedentary agriculture. This guest post has been formulating for several weeks. It summarizes a fascinating hypothesis in a guest post by Don Healy at WUWT some weeks ago, albeit posted for a different purpose.

Credit where due; this is not my idea. It is merely my formal hypothesis formulation of his original insight, involving a lot of casual research outside my wheelhouse. Yet another Climate Etc. learning experience. Abstract It has been known for decades from archeology that the incredibly important technological transition from small bands of hunter-gatherers to sedentary agriculture (wherever possible) took place about 10,000 years ago. Hunter/gatherer to sedentary agriculture transition There are many aspects to this crucial transition, backed by thousands of science papers. Domesticated dogs (Canis familiaris) emerged from wolf progenitors (Canis lupus), probably twice. Climate and Human Civilization over the last 18,000 years. Climate and Human Civilization over the last 18,000 years, updated | Andy May Petrophysicist.

By Andy May This is an updated timeline of climatic events and human history for the last 18,000 years. The original timeline was posted in 2013. The updated full size (Ansi E size or 34×44 inches) Adobe Reader version 8 PDF can be downloaded here or by clicking on Figure 1. It prints pretty well on 11×17 inch paper and very well on 17×22 inch paper or larger. To see the timeline in full resolution or to print it, you must download it.

It is not copyrighted, but please acknowledge the author if you use it. Figure 1 References to the images and data are given in this essay as hyperlinks. The heart of the poster is the timeline of historical and climatic events. Continue Reading #climate-change, #milankovitch-cycles, #younger-dryas. Climate and Human Civilization for the Past 4,000 Years | Watts Up With That? Guest essay by Andy May The Holocene Thermal Optimum ended at different times in different parts of the world, but it had ended everywhere by 4,000 BP (BP here means the number of years before 2000) and the world began to cool. The timeline shown in Figure 1 shows the GISP2 Central Greenland ice core temperature proxies in blue and the HadCRUT 4.4 surface temperature estimates for the same area in red.

Figure 1 (click on the figure to download in full resolution) Major events in human civilization are noted on the graph. If you download the pdf it prints well on 8.5×11 inch paper. Of necessity, this post covers the climate and human events in the northern hemisphere. The GISP2 temperature record covers the interval from 95 years ago to 50,000 years ago. The worldwide HadCRUT temperature anomaly grid is a 5° by 5° grid and many of the points over Greenland are unpopulated (null). Figure 2 Ice core data from this far north are very useful. Figure 4: Anthropogenic Climate Change Conclusions. Climate and People in the Prehistoric Arctic. Links pertaining to the agencies whose records are part of the Environmental Conservation Movement in Canada research collection Climate and People in the Prehistoric Arctic Robert McGhee Did past changes in climates have major effects on human history?

The question has been argued for a century or more, with numerous specific cases used as examples: the end of the Harappan civilization in northern India about 2200 BC, the fall of Mycenaean Greece about 1200 BC, and the rise of the great highland empires of the Andes. At a more distant time, it was proposed that the "bracing" semi-arctic climates of Ice Age Europe produced human populations that were world leaders in both biological and cultural development. The apparent European lead in development turned out to be merely a product of the large amount of archaeology carried out in Europe as compared with other areas. Arctic Canada may be a special case. The Palaeoeskimos Such a people arrived in arctic North America about 200 BC. History Is Clear: Humans Prospered In Climates That Were Warmer Than Today’s…Died In Cooler Ones.

A Short History of the Human Race Part 1, The Late Pleistocene, A Story of Survival By Ed Caryl The story of the human race, Homo Sapiens, is really a story driven by climate, particularly temperatures, rainfall, and sea level. Most of that history has taken place in the last 20,000 years, since the Last Glacial Maximum (LGM). But there was also some pre-history. Before we could advance to civilization, we needed to survive the the last glacial period. This was not easily done. 100,000 years ago, there were several species of Homo.

By 10,000 years ago there was just us, and that was just by the skin of our teeth. There is genetic evidence that in the period around 70,000 years ago, there may have been as few as 10,000 Homo Sapiens in the world. Figure 1 is a plot of Deuterium in a Greenland ice core, GISP2, a proxy for temperature. Several points are indicated in figure 1. Figure 2 is a detail from figure 1 of the period from 60,000 to 75,000 years ago. Climate Profoundly Impacted Development Of Civilization…Cool Periods Brought On Plagues/Death. A Short History of the Human RacePart 4/4. The Iron Age to the Present Research by Ed Caryl Climate historians usually recognize one Holocene Climate Optimum, from the end of the last ice age to about 4000 years ago. But as we have seen in this series of articles, there were three major warm periods, the first in the Upper Neolithic from 11,000 years BP to the 8.2 KY event, another from 8.2 KY to the 5.9 KY event, then the Bronze Age from 5.9 KY to 3.2 KY before present.

Each warm period resulted in a rise in sea level, the first melting most of the remaining ice from the ice age, the second finishing off the last ice in Canada and northern Europe. Each of these warm periods gave rise to a surge in population and technology. At 3200 years BP, cold dropped sea levels by over 2 meters. Figure 1 (from upper to lower trace) is sea level, Greenland ice core, and Antarctic ice core temperatures, with the orange Alpine Recession time line at bottom. Cool periods brought on plagues and death. 10 New Reconstructions Show Today’s Temperatures Still Among The Coldest Of The Last 10,000 Years. By Kenneth Richard on 10. September 2018 Even though CO2 concentrations hovered well below 300 ppm throughout most of the Holocene, newly published paleoclimate reconstructions affirm that today’s surface temperatures are only slightly warmer (if at all) than the coldest periods of the last 10,000 years.

This contradicts the perspective that temperatures rise in concert with CO2 concentrations. Bottom Graph Source: Rosenthal et al. (2013) 1. Nosova et al., 2018 “According to the present climate reconstruction, mid Holocene warming started only at 7,700 cal bp, with temperatures higher than now during the mid Holocene period. “The transition from the mid Holocene thermal maximum to the following period occurred without considerable climatic changes. 2. Bajolle et al., 2018 3.

Oswald et al., 2018 4. Coffinet et al., 2018 5. Zhao et al., 2018 6. Zheng et al., 2018 7. 1950-2015 Just 0.7°C Warmer Than Coldest Temps Of The Last 9,000 Years Harning et al., 2018 Wang et al., 2018 McFarlin et al., 2018. 108 Graphs From 89 New Papers Invalidate Claims Of Unprecedented Global-Scale Modern Warmth. By Kenneth Richard on 2. August 2018 During 2017, there were 150 graphs from 122 scientific papers published in peer-reviewed journals indicating modern temperatures are not unprecedented, unusual, or hockey-stick-shaped — nor do they fall outside the range of natural variability.

We are a little over halfway through 2018 and already 108 graphs from 89 scientific papers undermine claims that modern era warming is climatically unusual. For the sake of brevity, just 13 (15%) of the 89 new papers are displayed below. The rest of the non-hockey-stick scientific papers and graphs published thus far in 2018 can be viewed by clicking the link below. The list is also readily available on the NoTricksZone sidebar menu for easy reference. Wang et al., 2018 Badino et al., 2018 Haddam et al., 2018 “The MD07-3100 SSST [summer sea surface temperature] reconstruction displays values ranging from 8° to 17°C over the last 21 kyr.

Wu et al., 2018 Zheng et al., 2018 Ramos-Román et al., 2018 Stelling et al., 2018. 81 Graphs From 62 New (2018) Papers Invalidate Claims Of Unprecedented Global-Scale Modern Warming. By Kenneth Richard on 10. May 2018 During 2017, there were 150 graphs from 122 scientific papers published in peer-reviewed journals indicating modern temperatures are not unprecedented, unusual, or hockey-stick-shaped — nor do they fall outside the range of natural variability. We are a little over 4 months into the new publication year and already 81 graphs from 62 scientific papers undermine claims that modern era warming is climatically unusual. Zheng et al., 2018 “In this study we present a detailed GDGT data set covering the last 13,000 years from a peat sequence in the Changbai Mountain in NE China. The brGDGT-based temperature reconstruction from Gushantun peat indicates that mean annual air temperatures in NE China during the early Holocene were 5–7°C higher than today.

Furthermore, MAAT records from the Chinese Loess Plateau also suggested temperature maxima 7–9°C higher than modern during the early Holocene (Peterse et al., 2014; Gao et al., 2012; Jia et al., 2013). Mikis, 2018. 200 Non-Hockey Stick Graphs Published Since 2017 Invalidate Claims Of Unprecedented, Global-Scale Warming. By Kenneth Richard on 22. March 2018 46 New (2018) Non-Warming Graphs Affirm Nothing Climatically Unusual Is Happening Image Source: Lansner and Pepke Pederson, 2018 During 2017, there were 150 graphs from 122 scientific papers published in peer-reviewed journals indicating modern temperatures are not unprecedented, unusual, or hockey-stick-shaped — nor do they fall outside the range of natural variability. We are less than 3 months into the new publication year.

Already 46 new graphs from 40+ scientific papers undermine claims that modern era warming — or, in some regions, modern cooling — is climatically unusual. 2018 and 2017 Non-Hockey Stick Graphs (~200) Maley et al., 2018 Polovodova Asteman et al., 2018 Wündsch et al., 2018 McGowan et al., 2018 “Our reconstructed Tmax [temperature maximum] for these warmer conditions peaks around 1390 CE at + 0.8 °C above the 1961–90 mean, similar to the peak Tmax during the RWP [Roman Warm Period]. Wu et al., 2018 Hanna et al., 2018 Li et al., 2018 Eck, 2018. 485 Scientific Papers Published In 2017 Support A Skeptical Position On Climate Alarm. During 2017, 485 scientific papers have been published that cast doubt on the position that anthropogenic CO2 emissions function as the climate’s fundamental control knob…or that otherwise question the efficacy of climate models or the related “consensus” positions commonly endorsed by policymakers and mainstream media.

These 485 new papers affirm the position that there are significant limitations and uncertainties inherent in our understanding of climate and climate changes, emphasizing that climate science is not settled. More specifically, the papers in this compilation support these four main skeptical positions — categorized here as N(1) – N(4) — which question climate alarm. N(2) The warming/sea levels/glacier and sea ice retreat/hurricane and drought intensities…experienced during the modern era are neither unprecedented or remarkable, nor do they fall outside the range of natural variability, as clearly shown in the first 150 graphs (from 2017) on this list.

Part 1. Part 2. 150 NON-Global Warming Graphs From 2017 Pummel Claims Of Unusual Modern Warmth. 80 Graphs From 58 New (2017) Papers Invalidate Claims Of Unprecedented Global-Scale Modern Warming. Distinguishing Between ‘Safe’ or ‘Dangerous’ Warming Is Easy: ‘Dangerous’ Warming Is Red. The Proliferation Of Non-Global Warming Graphs In Science Journals Continues Unabated In 2018. The Hockey Stick Collapses: 60 New (2016) Scientific Papers Affirm Today’s Warming Isn’t Global, Unprecedented, Or Remarkable. New Paper Asserts ‘Biased’ Climate Models Underestimate Natural Variability And The Warmth Of The Past. 8 New Papers Reveal ‘Natural’ Global Warming Reaches Amplitudes Of 10°C In Just 50 Years With No CO2 Influence. Inconvenient: New paper finds the last interglacial was warmer than today – not simulated by climate models | Watts Up With That? 50 Inverted Hockey Sticks – Scientists Find Earth Cools As CO2 Rises.

‘Hide The Decline’ Unveiled: 50 Non-Hockey Stick Graphs Quash Modern ‘Global’ Warming Claims. New Study: Two Thousand Years of Northern European Summer Temperatures Show a Downward Trend | Watts Up With That? Yet another paper demonstrates warmer temperatures 1000 years ago and even 2000 years ago. | Watts Up With That? Receding Swiss glaciers incoveniently reveal 4000 year old forests – and make it clear that glacier retreat is nothing new | Watts Up With That? Archaeological Finds in Retreating Swiss Glacier « Climate Audit. Climate Study: Scotland Warmer in 1300s, 1500s, and 1730s - Principia Scientific International. Scottish summers not doing anything they haven’t done for 800 years already. 2 More New Papers Affirm There Is More Arctic Ice Coverage Today Than During The 1400s. Significant finding: Study shows why Europe’s climate varied over the past 3000 years.

New paleo reconstruction shows warmer periods in Alaska over the past 3000 years | Watts Up With That? Inconvenient new study: Canadian Arctic had significantly warmer summers a few thousand years ago | Watts Up With That? Parts of Asia Were Warmer During the Holocene Than They Are Now. Four Centuries of Summer Temperatures in Coastal Northern Japan. A never before western published paleoclimate study from China suggests warmer temperatures in the past. A Thousand-Year Drought History of China's Qilian Mountains. An 850-Year Hydroclimatic History of Northwestern China. Four Centuries of Spring Temperatures in Nepal. A 2000-Year SST History of the Northeastern Arabian Sea. 1200 Years of Historic Streamflow in the Eastern Great Basin of North America. A Review of Temperature Reconstructions | Andy May Petrophysicist.

Lindzen, Soon and Spencer debunked? Hockey Stick Was Refuted Before Its Fabrication – Study Ignored – IPCC And Mann Took World On 10-Year Joyride. No. The Miocene is not an example of the “last time it was as warm as it’s going to get later this century”… Argh! Paleoclimatological Context and Reference Level of the 2°C and 1.5°C Paris Agreement Long-Term Temperature Limits | Earth Science.

Deconstruction Of The Critical YouTube Response To Our 400+ ‘Skeptical’ Papers Compilation. A review of temperature reconstructions | Watts Up With That? Easterbrook on the magnitude of Greenland GISP2 ice core data | Watts Up With That? Nature Unbound III – Holocene climate variability (Part B) | Climate Etc. Global Temperature Trends From 2500 B.C. To 2040 A.D. - Principia Scientific International.

Comparing the Kobashi and Alley Central Greenland Temperature Reconstructions | Andy May Petrophysicist. Another New Paper Reveals No Discernible Human Influence On Global Ocean Temperatures, Climate. Ice Patch Archaeology in Global Perspective: Archaeological Discoveries from Alpine Ice Patches Worldwide and Their Relationship with Paleoclimates. “We Live In The Coldest Period Of The Last 10.000 Years" | NOT A LOT OF PEOPLE KNOW THAT. CO2: Ice Cores vs. Plant Stomata | Watts Up With That?

The oldest ice core – Finding a 1.5 million-year record of Earth’s climate | Watts Up With That? Paleo-clamatology | Watts Up With That? HH Lamb–“Climate: Present, Past & Future–Vol 2”–In Review–Part I | NOT A LOT OF PEOPLE KNOW THAT. Modeling 12 Centuries of Northern Hemispheric Hydroclimate. Warmest in a Millll-yun Years « Climate Audit.