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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
This new study pokes holes in the dogma five different ways
Credit to Kenneth Richards who found the study and discussed it at NoTricksZone
Bones in a cave inside the Arctic circle show that the world was hotter, the climate is always changing, and life adapts very well.
A special cave in far northern Norway has a a trove of thousands of old bones. They are deposited in layers that stretch back from 5,800 years ago to 13,000 years ago. And it’s been a radical change: at the start, the cave was submerged under the ocean, so the bones are mostly marine species. But a few thousand years later the weather was warm, and birds and mammals had moved in. By 6,000 years ago the researchers estimate it was the hottest part of the Holocene and 1.5°–2.4°C warmer than the modern era of 1961–1990.
After that, the cave was blocked by scree, and the bone fragments sat there seemingly undisturbed for nearly 6,000 years while the ice sheets moved and the Vikings came and went and the world cooled. Then in 1993 someone happened to build a road nearby and found the cave. Now a team […]
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 […]
By Jo Nova
Kap København is almost the closest point there is to the North Pole on dry land.
The survival of some DNA for two million years is astounding all of itself — breaking the record for oldest known DNA by nearly a million years. Before this, the oldest DNA was thought to be 1.2 million years — beyond which all the global DNA of all the species that ever lived was assumed to be dissolved into unreadable mush.
But now we have found enough of the ancient code to identify a whole ecosystem on the northern edge of Greenland that no one expected to find. Apparently giant elephant-like Mastodons were wandering the far northern parts of Greenland — practically as close as they could get to the North pole without swimming.
At the time, the world was not just 1.5 catastrophic degrees warmer than today, but a full nuclear 10 to 17 degrees hotter.
Strangely life on Earth wasn’t suffering the sixth mass extinction.
Discovery of world’s oldest DNA breaks record by one million years
ScienceDaily
The incomplete samples, a few millionths of a millimetre long, were taken from the København Formation, […]
We panic about the next half degree of warming (above the 1.5 we’ve already had) but the depth of the ice age was savagely cold. For years the experts told us what Earth’s temperature was then, but apparently they were wrong.
And yet corals and rainforest survived. Plus turtles, whales, kittens — lots of things. And all without research grants.
…
Nice line on the Nobel gas calibration with ground temperatures. Nice proxy.
Two studies have come out in the last 10 months both showing that at its coldest point about 25,000 years ago, the Earth was on average six degrees cooler Celcius than it is today. And this new study includes estimates of temperatures of tropical land near the oceans which ought to be more stable and less prone to big extremes.
This comes from a newer style of proxy based on noble gases dissolved in ground water. It appears to be quite an accurate proxy, judging by the graph to the right. And it solves a lot of problems with other proxies. We can take samples from all around the world instead of just the polar ice caps (like we can with ice cores). […]
Don’t look now, it’s a climate disaster of massive proportions and it has nothing to do with CO2.
Scientists have just discovered what they say was a wild era 42,000 years ago — where the Earth’s magnetic field practically disappeared. They’ve called it the Adams Event (after Douglas Adams of Hitchhikers Guide fame).
This was hidden previously, just before the Laschamp Excursion which we’ve known about since 1969. That event happened about 41,000 years ago – during which the Earth’s magnetic field briefly flipped. It was a pretty big deal in itself. For 800 years the field strength fell to 28% of it’s current strength and was reversed North-to-south. Due to the weak magnetic field, the theory is that cosmic rays zinged further into the atmosphere and created a layer of enriched beryllium 10 and carbon 14 which remains to this day in a thin slice around the world buried under all the layers of dirt that came after it.
The giant kauri tree log preserved in Ngāwhā, New Zealand, was alive during the Adams Event. Photo: Nelson Parker https://www.nelsonskaihukauri.co.nz/
Extraordinarily, during all this, one giant Kauri tree managed to live for more than 1,700 years. It grew […]
MIT researchers think they have solved a bit of a mystery regarding Sahara dust, but if they’re right it means the Sahara Desert has already come and gone 3 – 5 times since humans walked the Earth. The Sahara is the largest desert on Earth, and this would be the largest and longest drought “ever” on the planet (as far as we know).
UPDATED: Commenter Javier points out these drying cycles were known years ago. (See below)
This would rather redefine the whole idea of “climate change” — 3.5 million square miles of Green Sahara turns into Dust-bowl Sahara — and it’s all thanks to sunlight. The drought doesn’t just last 7 years, but more like 7,000. And it’s happening over 9 million square kilometers, an area larger than Australia. The major climate models leaned towards the monsoonal cycle, rather than the longer ice age one. So this theory may have resolved one of the 495 contradictions in climate models. Or not. But the bigger message here is that the sun causes climate change and on a massive scale.
h/t to Roger Tallbloke.
The Sahara is the largest dust bowl in the world, dumping 10 million trucks of dust across […]
The Pliocene is coming to get you.
The shocking news is that the world cooled for 50 million years, then, just like that, two hundred years ago, humans stopped the cooling, and turned the global clock, or thermometer, whateveryoucallit, around. Now, unleash the disaster — by 2030 Earth is going to resemble the mid-Pliocene. So in just 11 years time, it will be like 3 million years ago. Apparently we are losing 250,000 years every year. Buy a solar panel now!
You think I’m joking:
Humans may be reversing the climate clock, by 50 million years
Our future on Earth may also be our past.
In a study published Monday (Dec. 10, 2018) in the Proceedings of the National Academy of Sciences, researchers show that humans are reversing a long-term cooling trend tracing back at least 50 million years. And it’s taken just two centuries.
By 2030, Earth’s climate is expected to resemble that of the mid-Pliocene, going back more than 3 million years in geologic time.
How bad was the Pliocene?
In the Pliocene, North and South America joined tectonically, the climate was arid, land bridges allowed animals to spread across […]
Gotta love a long unbroken proxy.
Scientists looked at 44 pines sites across the Scottish Highlands and used their tree rings to create a continuous temperature series for the last 810 years. Showing admirable restraint, they did not paste on adjusted thermometer records to create a hockey stick effect. Instead we can see that Scottish summers were just as warm in the 1300s, the 1280s and around 1500 as well.
The rate of warming is not unprecedented. The temperature is not unusual. But thermometers don’t tell the same story as the tree rings in the last 50 years. They both can’t be right. Either the tree rings are always unreliable thermometers or the thermometers are placed near ice cream trucks and adjusted up-the-kazoo?
Thanks to CO2Science:
Rydval et al. extended “the previously published Scottish dendroclimatic record (Hughes et al., 1984) by nearly 500 years,” in order to create an 810-year-long proxy over the period AD 1200-2010. The reconstruction was derived from a network of 44 Scots pine (Pinus Sylvestris) sites across the Scottish Highlands from both living and subfossil samples that correlated well with summer (July-August) temperatures.
In placing the most recent warming of the instrumental […]
Strap yourself down – a puzzle you never knew existed has finally been solved!
Nov 16, 2017: Scientists Solve 22 Million-Year-Old Climate Puzzle –“Paleoclimate Events Can Predict Earth’s Future”
Solved yesterday, settled today! That’s a rapid fire consensus… (they actually use the word “settled” in the title of the paper)
Study Settles prehistoric puzzle, confirms modern link of carbon dioxide and global warming
Finally poor Miocene researchers can sigh with relief as the first study in years shows what they *knew* was the right answer and now they can issue press releases, rest their weary minds, and stop trying to think of excuses as to why their results didn’t fit with The Climate Model Testaments.
Who knew there were large discrepancies and carbon dioxide did not fit the temperature theory for a million years or so? Not the public.
Where were the press releases telling us there was a mystery to solve?
Research Shows A High Temperature World Had Nothing To Do With CO2 Study shows temperatures fell dramatically, CO2 stayed the same Study shows models have no freaking clue what controls the climate
Exactly, never.
The mystery they are talking about is the one marked Mi-1, 22 […]
There was no Medieval Warm Period in China. No little ice age either. Not warm in Roman times either.
Obviously CO2 controls this climate.
(Click to enlarge)
Quansheng et al show that weather is lumpy, that modern warming is a lot like past warming. They go so far as to say that there are regular cycles and hint that sun might have something to do with it, and volcanoes.
“…centenial variation is significantly correlated with long-term changes in solar radiation—especially cold periods, which correspond approximately to sunspot minima, as well as the frequency of large volcanic eruptions.”
They go on to say that rate of warming was about half a degree per century lately. It may have been the fastest rate, but then again, it may not. It was hard to tell with the error bars being so wide. It was all done with proxies and has a ten year resolution. Obviously it is in need of having homogenadjustoided thermometer data added after 1960 as is the custom in climate science.
The Medieval Warm Period was global Medieval Warm Period found in 120 proxies. Plus Roman era was similar to early 20th Century. Sun controls half of […]
Don’t tell me that cold is nice and the climate was ever ideal
A few scientists thought that the climate was stable and well behaved during the Holocene until we invented coal power and the Ford Model T and everything fell apart “unprecedentedly”.
But 8200 years ago things apparently got pretty wild. See the GISP graph below where there was a three degree fall in temperatures suddenly (circled in red below). A new study found that at the same time China and California also cooled. Strangely, this cooling effect probably did not produce calm, happy days for the Californians at the time. Instead it looks like they got 150 years of intense winter storms and a lot of wet weather.
UPDATE: This graph shows the ice-core data up until 1855. The last 150 years (1705 to 1855) are highlighted in red to show the warming as the Earth began coming out of the LIA. Obviously that red line would continue up further if it was drawn to the present.
Looks like real climate change….
The reason for the sudden snap is possibly that a couple of massive glacial lakes in North East America collapsed and suddenly drained out […]
Now this is climate change. If you can believe this study, wow:
“In the tropics, annual mean temperature fell from 27 to 5 degrees Celsius”
And we worry about a warming of one degree in a century.
“It became cold, I mean, really cold,” says Brugger. Global annual mean surface air temperature dropped by at least 26 degrees Celsius. The dinosaurs were used to living in a lush climate. After the asteroid’s impact, the annual average temperature was below freezing point for about 3 years. Evidently, the ice caps expanded. Even in the tropics, annual mean temperatures went from 27 degrees to mere 5 degrees. “The long-term cooling caused by the sulfate aerosols was much more important for the mass extinction than the dust that stays in the atmosphere for only a relatively short time. It was also more important than local events like the extreme heat close to the impact, wildfires or tsunamis,” says co-author Georg Feulner who leads the research team at PIK. It took the climate about 30 years to recover, the scientists found.
The real threats are not fertilizer and balmy weather, but rocks from space, and cold, cold, cold…
How the […]
There have been suggestions that Jo Nova might be trying to hide or ignore the most recent boreholes graph from Huang et al. So here it is. This is the last 2,000 years according to 6000 boreholes, with the last 100 years also using the “instrumental record” which gives us that hockey-stick uptick at the end. Below I explain the pros and cons of this study and update my thoughts.
Huang and Pollack 2008: Their latest boreholes published study
A borehole sounds like a bit-of-a-stretch as a proxy. How could we tell if the world was warmer in 1066 by drilling a hole in the ground? Yes, fair point. But what makes boreholes useful is that they are global and there is a lot of data: specifically 6,000 holes all over the world.
I’ve been looking at boreholes in more detail, analyzing them in the light of newer proxies. When all the evidence is considered, boreholes turn out be not-much-use at giving us meaningful numbers in degrees C, and in my opinion, not-too-hot at telling us the “when” of an event either. Too much depends on assumptions.
But what are they good for is that, when combined with […]
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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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