But how do we actually know, and how much do we actually know, about historic and prehistoric temperatures? In this Climate Discussion Nexus “Backgrounder” video John Robson examines the uses,…
Category: Paleoclimatology
Comprehensive Russian Temperature Reconstruction Shows Warmer Temperatures 1000 Years Ago!
Result: it was modestly warmer 1000 years ago than it is today.
MWP 1.5C Warmer Than 1900–Says HH Lamb
Generally speaking we are looking at Medieval temperatures between 1.0C and 1.5C higher than in 1900.
The Holocene Climatic Optimum and the “pre-industrial”
By Andy May The “pre-industrial” according to the IPCC in a footnote on page 43 of AR6 WGI is prior to 1750 for radiative forcings and before 1850 for temperature.…
IPCC’s New “Hockey Stick” Temperature Graph
The United Nations’ Intergovernmental Panel on Climate Change (IPCC) published their latest assessment report (AR6) in 2021. In 2023, the Clintel Foundation published a report which criticizes AR6.
PETM Caused by Passing Star?
Could a passing rogue star have caused the PETM? Could other astrophysical phenomena been primary drivers of paleoclimate change?
Hottest In 125,000 Years?
Anybody who claims that this year is the hottest for 125,000 years is fraudulent.
After 25 years, Mann’s Other Nature Trick Unraveled
Mann made it impossible for anyone to carry out routine statistical tests on his famous reconstruction.
Melting ice reveals dozens of 7,000-year-old artifacts in Canada.
Archaeologists surveyed melting ice patches in Canada and uncovered dozens of ancient artifacts spanning 7,000 years. Photos show the “unique” — and perishable — finds.
When Climate Change Really Was an Existential Threat
Guest “Could have used the Extinction Rebellion back then!” by David Middleton, What was going on from 1,000-800 ka that may have nearly wiped out our ancestors? Temperatures plunged, glaciers…
A Brief History of Climate, From Prehistory to The Imaginary Crisis of the 21st Century
Climate history clearly shows that we’re living in a blessed time, and that past civilizations generally prospered during warm periods and declined during cold ones.
Claim: Climate Change Likely Led to Violence in early Andean Populations
Round and round the p-hacking wheel goes. Where it stops, nobody knows.
“How CO2 Starvation & Plate Tectonics Caused the Greatest Mass Extinction, the Permian Great Dying”
The gradual sequestering of CO2 over millions of years gradually dropped CO2 to starvation levels that reduced photosynthesis, causing the “phytoplankton blackout” and Carboniferous Rainforest Collapse, wide spread ecosystem disruptions…
Surprise: Hurricane Activity Reconstructions Show Greater Storm Frequency When Globe Was Cold
warmer periods don’t mean more hurricanes and it appears that colder periods are associated with greater hurricane frequency.
Ice Cores, Temperatures, And CO2
Guest Post by Willis Eschenbach I got to thinking about the ice cores. It’s pretty amazing to realize that the air trapped in the tiny bubbles in the ice is…
McIntyre: Reverse engineering a ‘hockey stick’ shows ‘bogus methodology’
It’s worse than anyone can imagine.
Largest-ever genetic analysis of grapevine varieties reveals how glacial cycles shaped grape domestication and the rise of wine
Among their findings, they uncover more about the genetics underlying white grape color, and the ancient muscat flavor; at least one allele underlying muscat flavor may be detrimental to plant…
Holocene CO2 and the earlier IPCC Reports
By Andy May This post has been translated into German by Christian Freuer here. As I noted in my earlier post, “The IPCC AR6 Report Erases the Holocene,” the IPCC…
Do European tree ring analyses indicate unusual recent hydroclimate?
MBF23 should be corrected and retitled because some key conclusions, including the headline claim in its title, are not supported by proper statistical analysis of the SPEI values that their…
Kumimanu fordycei: The Giant Penguins of the Paleocene Epoch
Giant penguins thrived in a much warmer world, without year-round sea ice… Yet modern penguins are doomed by warming temperatures and declining year-round sea ice… Right.
Low atmospheric CO2 levels before the rise of forested ecosystems
Ultimately, the composition of Earth’s atmosphere is governed by an interplay between biological and geological processes and how land plants and their root symbionts affect the physical and chemical weathering…
Ice Age Temperatures and Precipitation Reconstructed from Earthworm Granules
New method for determination of past climate data on land applied comparatively for the first time / Ice Age summers in Central Europe were at times warmer than previously known.