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By Kenneth Richard on 22. July 2024
There were millennia during the past glacial (when CO2 levels were under 200 ppm) that were as warm or warmer than today. Four central Europe reconstructions, using collected evidence from disparate biomarkers, indicate there were periods (for example, 54,000 to 51,000 years ago, the Bølling–Allerød interstadial, 14,700 years ago) during the last glacial when temperatures […]
Posted in Paleo-climatology |
By Kenneth Richard on 15. July 2024
Popular claims that CO2 changes drive temperature changes currently or throughout the distant past “are based on imagination and climate models full of assumptions.” A comprehensive new study details a stochastic assessment determination of the sequencing of CO2 variations versus temperature variations since the 1950s, over the last 2,000 years (the Common Era), and throughout […]
Posted in Climate Sensitivity, Paleo-climatology |
By Kenneth Richard on 5. July 2024
Scientists continue to uncover evidence of a much warmer Early Holocene, when CO2 hovered near 260 ppm. According to a new study, an ancient 42-centimeter long oyster shell has been found ~20 km inland from today’s Taipei Basin (Taiwan) coast. Extensive isotope analyses (69 of them) of a 5 cm section of the shell reveal […]
Posted in Oceans, Paleo-climatology |
By Kenneth Richard on 20. June 2024
Greenland has not warmed (net) in the last 90 years. From 80,000 to 20,000 years ago Greenland warmed by 10-15 Kelvin within a span of “a few decades” 24 times (Kypke and Ditlevsen 2024). These abrupt warming periods occurred without concomitant CO2 concentration changes. And, of course, without human interference. Image Source: Kypke and Ditlevsen […]
Posted in Cooling/Temperature, Natural Variability, Paleo-climatology |
By Kenneth Richard on 17. June 2024
In a new study, scientists use the new “ostracod-clumped isotope thermometer” to reconstruct a much warmer Late Pleistocene/Early Holocene Mediterranean climate. Today’s average summer and winter temperatures are 22°C (21.4°C) and 8°C, respectively, at Central Italy’s Lake Trasimeno. Around 11,000-12,000 years ago, when CO2 hovered in the 220-230 ppm range, summer temperatures averaged 25°C, sometimes […]
Posted in Paleo-climatology |
By Kenneth Richard on 6. June 2024
A new West Greenland temperature reconstruction (Strunk et al., 2024) finds the region was 1.5 to 2°C warmer than today from 560 to 1100 CE, encompassing the Medieval Warm Period (MWP). The LOI (vegetation abundance) record reflects a much wetter, greener landscape during the MWP. Image Source: Strunk et al., 2024
Posted in Cooling/Temperature, Paleo-climatology |
By Kenneth Richard on 30. May 2024
“Modern warming is within natural Holocene climate variability” – Kullman and Öberg, 2024 From about 16,800 to 6000 years ago warmth-dependent tree species grew 300-700 altitudinal meters higher than they do today on Mt. Åreskutanthan, Swedish Scandes. Due to the well-known warmth threshold for boreal tree species and the lapse rate (0.6°C per 100 m), […]
Posted in Natural Variability, Paleo-climatology |
By Kenneth Richard on 27. May 2024
Scientists refer to the Middle and Late Holocene’s much warmer and wetter regional climate as “favorable,” “optimal” and “the best.” New research from a Loess Plateau study site identifies mean annual temperatures as 9.86°C today, while annual precipitation averages 531 mm. These values are shown to be among the coldest and driest of the last […]
Posted in Paleo-climatology, Warming/CO2 Benefiting Earth |
By Kenneth Richard on 9. May 2024
A new study finds warmth-demanding species could survive in the Holocene Arctic (northern Norway) hundreds to thousands of km north of where they reside today. This affirms temperatures were “higher than today” with much less snow and ice back then. DNA evidence from a site north of the Arctic Circle indicates African wildcat (Felis lybica) […]
Posted in Arctic, Paleo-climatology |
By Kenneth Richard on 6. May 2024
Human footprints embedded into rock that used to be a sand beach at the limit of the seashore’s “swash flow” and high tide lie 20 to 30 meters above the present sea level. The footprints are dated to ~90,000 years ago. It is estimated that sea levels were globally about 6 to 9 meters higher […]
Posted in Paleo-climatology, Sea Levels |
By Kenneth Richard on 2. May 2024
“CO2 is only present in the atmosphere in trace amounts (0.04%) and lacks sufficient enthalpy to have any measurable effect on the atmosphere’s temperature.” – Nelson and Nelson, 2024 New research (Nelson and Nelson, 2024) further documents the inconsequential role that CO2 plays in climate. Less than 4% of longwave infrared radiation is absorbed by […]
Posted in Climate Sensitivity, CO2 and GHG, Paleo-climatology |
By P Gosselin on 14. April 2024
Dr. Michael E. Mann and the IPCC claims of a hockey stick temperature trend are challenged. A paper published by a team of scientists of the Russian Academy of Sciences led by В. V. Klimenko presents a quantitative reconstruction of the mean annual temperatures of northeastern Europe for the last two millennia. The study was […]
Posted in Arctic, Paleo-climatology |
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