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By Jo Nova
How much money has the world wasted because of some tree ring studies?
A Chinese group has looked at all the different kinds of 2,000 year long proxies in the PAGES dataset and found that history looks quite different depending on which proxy you pick. Only the tree rings show the HockeyStick shape that matches the climate models. In other proxies, temperatures have fallen for most of the last 2,000 years, especially in the Southern half of the world. And even after the recent warming, we are not yet back to the temperatures the Romans lived through.
So yet again, we see that that current temperatures are not unusual except according to tree rings, which we know are affected by rising levels of CO2. (The paper does not mention CO2 or carbon or fertilizer).
“All the evidence points out that we are still far from a complete understanding of the Common Era temperature variability at hemispheric and global scales,” says Professor Yang.”
“We show that the millennial cooling of annual mean temperatures is likely a global phenomenon.”
The world according to tree-rings is at the top, and other proxies, below:
[…]
By Jo Nova
The Roman Climate Optimum lives
Quietly hidden in a paper about ancient pandemics is the most detailed estimate of Roman temperatures I’ve ever seen. For 800 years temperatures gyrated over a three degree range. The Climate Alarmists of Rome could have run the whole warming-cooling-warming-scare back to back for 400 years. But make no mistake, the good times, Pax Romana — were the warmest and wettest ones. The colder times are associated with aridity, plagues and collapse.
Two thousand years ago plankton bloomed and died, and the different ratios of warm and cool species left thick layers on the ocean floor just off the heel of the boot of Italy. Every ten years another centimeter thick layer of dead dinocysts collected on the sea floor, which makes for a remarkably detailed record. They report a jaw dropping “three year resolution”. The record was so rich they could pick out the seasons, and wow, by golly, they could compare it with modern air temperatures. (See graph A below) Though, for some reason they don’t make that easy, or say much about how those ancient temperatures compare to today. (Presumably, if they found things were hotter today, they’d have […]
By Jo Nova
Nothing at all about the modern era stands out as unusual
Thanks to David Whitehouse at NetZeroWatch who has found a remarkable paper: Pyrenean caves reveal a warmer past
The new study on stalagmites in caves of the Pyrenees shows that modern climate change is nothing compared to normal fluctuations in the last 2,500 years, when it was at times much hotter, colder, and more volatile. Rapid shifts between temperatures were common.
The researchers looked at 8 stalagmites in 4 caves and local lake levels, but they also compared their results with other European temperature proxies and reconstructions and the pattern is consistent across the region. The Roman Warm Period was much hotter than today, and for hundreds of years as well, even though coal plants were rare. Apparently, there was a reason Romans were dressed in togas.
The Dark Ages were very cold, especially around 520 – 550AD — which may be related to what the researchers call a “cataclysmic” volcanic eruption that took place in Iceland in 536AD. It was followed by two other massive volcanic eruptions in 540 and 547AD. This effect is apparently visible in European tree rings which showed “an unprecedented, long-lasting […]
There’s a reason the Romans wore Togas
A new study near Sicily shows the sea surface temperatures were a whole two degrees Celsius warmer then. The worst-case scenario of the Paris Agreement has already happened, and it was nearly 2,000 years ago. And instead of being a baked-earth apocalypse, the Roman empire flourished during the warmth and declined as it cooled.
Time to burn oil and Make Rome Great Again?
The expansion of the Roman Empire coincided with the warmest period in the Mediterranean of the last 2,000 years.
Probably just a coincidence. /
A formanifera with the awkward name of Globigerinoides ruber apparently likes to live near the sea surface around 10 to 50 m down. Depending on the temperature, it ends up with slightly different ratios of calcium and magnesium. At some point it dies, sinks and sits in a mud layer on the sea floor 475m below. Eventually, for this lucky mud, someone digs it out and analyses it. This new study suggests the Mediteranean warmed up during Roman times from AD 1 to AD 500.
This was the Roman Climatic Optimum — an era we are spending trillions to avoid.
The researchers suggest that cooling and […]
Here we go again. For five or so years believers didn’t really mention the Medieval Warm Period. Too bruised by the embarrassment of Hockey Stick Zombie failures. But it’s an inconvenient era they have to rub out because none of the expert models can explain what caused it, and it’s hard to panic about same temperatures that Edward the Confessor survived with oxen and carts.
And it’s hard to call the modern warmth “man-made” if nature created something just like it 1,000 years ago.
Climate change: We haven’t experienced anything like this in the past 2,000 years
By Michael Collett, ABC, Environmental Copy and Paste Promoter
Climate scientists writing in the journal Nature have found there is no evidence for “globally coherent warm and cold periods” over the past 2,000 years prior to industrialisation.
That’s significant, because climate change deniers have sometimes pointed to epochs like the so-called “Little Ice Age” or “Medieval Warm Period” to argue that the current global warming is one among multiple similar global climate events.
But what the research actually shows is that other “peak warming and cooling events” over the past two millennia appear to have […]
Glaciers that tore trees in half and then froze the stumps are receding again in Alaska to reveal those old remnants of a warmer era. I like these little “concrete” anecdotes, though their true meaning depends on exactly how old these remains are, and whether that timing correlates with warming in other places.
Ancient trees emerge from frozen forest ‘tomb’ Retreat of the Mendenhall Glacier reveals the remains of trees which grew more than 2,000 years ago By MARY CATHARINE MARTIN JUNEAU EMPIRE
The Mendenhall Glacier’s recession is unveiling the remains of ancient forests that have remained frozen beneath the ice for up to 2,350 years.
….
The most recent stumps she’s dated emerging from the Mendenhall are between 1,400 and 1,200 years old. The oldest she’s tested are around 2,350 years old. She’s also dated some at around 1,870 to 2,000 years old.
8.9 out of 10 based on 97 ratings […]
Gullible Rudd steps right in it
Rudd let slip a line in his frustration this week that reveals how little he knows about the topic he holds so dear. He has so completely swallowed the PR on climate science, that when poked, he reflexively fires back exaggerated scientific claims that would make even the IPCC blush. In 2007 the IPCC and Gore et al offered Rudd the perfect Election-Wedge-on-a-Platter. They’d primed the audience with propaganda; trained the crowd to recite: Carbon is pollution. It looked like a no-brainer. Yet having based his leadership and campaign on it, it’s obvious he had not done even the most basic of checks (and still apparently hasn’t).
It’s an abject lesson in the importance of doing some homework before rewriting a nation’s economy.
Toga's don't keep you warm
Last week Tony Abbott (the Australian opposition leader) told school children that it was warmer ”at the time of Julius Caesar and Jesus of Nazareth”. This banal line set off a flurry of denial and bluster.
Rudd was incredulous in the Parliamentary Hansard record to the opposition members last week:
…how is it that, in the 21st century, you could support this Leader of the […]
Greenland Interglacial Temperatures – last 10,000 years. Are we headed for an ice age? (See below for more detail.)
David Lappi is a geologist from Alaska who has sent in a set of beautiful graphs–including an especially prosaic one of the last 10,000 years in Greenland–that he put together himself (and which I’ve copied here at the top).
If you wonder where today’s temperature fits in with the grand scheme of time on Earth since the dinosaurs were wiped out, here’s the history. We start with the whole 65 million years, then zoom in, and zoom in again to the last 12,000 from both ends of the world. What’s obvious is that in terms of homo sapiens history, things are warm now (because we’re not in an ice age). But, in terms of homo sapiens civilization, things are cooler than usual, and appear to be cooling.
Then again, since T-rex & Co. vanished, it’s been one long slide down the thermometer, and our current “record heatwave” is far cooler than normal. The dinosaurs would have scoffed at us: “What? You think this is warm?”
With so much volatility in the graphs, anyone could play “pick a trend” and depending […]
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JoNova A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).
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