Keeping global warming to within 1.5-2 degrees C may be more difficult than previously assessed, according to researchers. An international team of scientists has published a study in the Proceedings of the National Academy of Sciences (PNAS) showing that even if the carbon emission reductions called for in the Paris Agreement are met, there is a risk of Earth entering what the scientists call “Hothouse Earth” conditions.
“Human emissions of greenhouse gas are not the sole determinant of temperature on Earth. Our study suggests that human-induced global warming of 2 degrees C may trigger other Earth system processes, often called feedbacks, that can drive further warming—even if we stop emitting greenhouse gases,” says lead author Will Steffen from the Australian National University and Stockholm Resilience Centre. “Avoiding this scenario requires a redirection of human actions from exploitation to stewardship of the Earth system.”
Currently, global average temperatures are just over 1 degrees C above pre-industrial and rising at 0.17 degrees C per decade.
The authors of the study consider 10 natural feedback processes, some of which are “tipping elements” that lead to abrupt change if a critical threshold is crossed. These feedbacks could turn from being beneficial, by storing carbon, to a source of uncontrollable emission in a warmer world. These feedbacks are permafrost thaw, loss of methane hydrates from the ocean floor, weakening land and ocean carbon sinks, increasing bacterial respiration in the oceans, Amazon rainforest dieback, boreal forest dieback, reduction of northern hemisphere snow cover, loss of Arctic summer sea ice, and reduction of Antarctic sea ice and polar ice sheets.
“These tipping elements can potentially act like a row of dominoes. Once one is pushed over, it pushes Earth toward another. It may be very difficult or impossible to stop the whole row of dominoes from tumbling over. Places on Earth will become uninhabitable if ‘Hothouse Earth’ becomes the reality,” adds co-author Johan Rockström, executive director of the Stockholm Resilience Centre and incoming co-director of the Potsdam Institute for Climate Impact Research.
Hans Joachim Schellnhuber, director of the Potsdam Institute for Climate Impact Research, says, “We show how industrial-age greenhouse gas emissions force our climate, and ultimately the Earth system, out of balance. In particular, we address tipping elements in the planetary machinery that might, once a certain stress level has been passed, one by one change fundamentally, rapidly, and perhaps irreversibly. This cascade of events may tip the entire Earth system into a new mode of operation.”
“What we do not know yet is whether the climate system can be safely ‘parked’ near 2 degrees C above preindustrial levels, as the Paris Agreement envisages. Or if it will, once pushed so far, slip down the slope towards a hothouse planet. Research must assess this risk as soon as possible.”
Cutting greenhouse gases is not enough
Maximizing the chances of avoiding a “Hothouse Earth” requires not only reduction of carbon dioxide and other greenhouse gas emissions, but also enhancement and/or creation of new biological carbon stores, for example, through improved forest, agricultural and soil management; biodiversity conservation; and technologies that remove carbon dioxide from the atmosphere and store it underground, the paper says. Critically, the study emphasizes that these measures must be underpinned by fundamental societal changes that are required to maintain a “Stabilized Earth” where temperatures are ~2 degrees C warmer than the pre-industrial era.
“Climate and other global changes show us that we humans are impacting the Earth system at the global level. This means that we as a global community can also manage our relationship with the system to influence future planetary conditions. This study identifies some of the levers that can be used to do so,” concludes co-author, Katherine Richardson from the University of Copenhagen.
“… the climate system can be safely ‘parked’ near 2 degrees C above preindustrial levels”
What a load of BS, especially since we’ve been told all sorts of terrible consequences will occur at 2C and it is “officially unsafe“. Now apparently it’s “safe”. Got that folks? The climate pays attention to our history and the whims of the Schellnhuber pronouncements.
Note to my Internet stalker “Sou” aka Miriam O’Brien: I know you’ll want to jump all over this, please, be my guest. Make my day.
Of course they don’t bother to give a link to the paper in PNAS, and given the absurdity of the press release, I’m not going to bother looking for it. It’s not worth reading.
Here is the LINK to the PNAS paper.
Trajectories of the Earth System in the Anthropocene
http://www.pnas.org/content/early/2018/07/31/1810141115
The abstract is politically charged.
In case some user is interested in the full: https://workupload.com/file/rKyCzu9
The authors include Will Steffen, Johan Rockström, Katherine Richardson, Timothy M. Lenton, Diana Liverman and Hans Joachim Schellnhuber. They have published together variously on this theme for some time, common to all is Schellnhuber and his Potsdam Institute. The list is not exhaustive. Rockström is now taking over as Co-Director of Potsdam with Ottmar {Climate Change is now Wealth Distribution] Edenhofer.
February 2005
Breaking News – Only huge emissions cuts will curb climate change
https://www.newscientist.com/article/dn6964-only-huge-emissions-cuts-will-curb-climate-change/
“To have half a chance of curbing global warming to within safe levels, the world’s greenhouse gas emissions need to fall dramatically to between 30% and 50% of 1990 levels by 2050, a new study suggests.” This was actually Meinshausen, who then joined Potsdam in 2006. Formerly worked for Greenpeace and WWF as a “consultant”, has been the Director of the Australian-German College [Potsdam] at The University of Melbourne since 2012
February 2008
https://www.ncbi.nlm.nih.gov/pubmed/18258748
Lenton TM, Held H, Kriegler E, Hall JW, Lucht W, Rahmstorf S, Schellnhuber HJ.
“Here we introduce the term “tipping element” to describe large-scale components of the Earth system that may pass a tipping point. We critically evaluate potential policy-relevant tipping elements in the climate system under anthropogenic forcing, drawing on the pertinent literature and a recent international workshop to compile a short list, and we assess where their tipping points lie. An expert elicitation is used to help rank their sensitivity to global warming and the uncertainty about the underlying physical mechanisms”.
March 2009 Pre-Copenhagen
https://www.pik-potsdam.de/news/press-releases/files/synthesis-report-web.pdf
Rapid, sustained, and effective mitigation based on coordinated global and regional action is required to avoid “dangerous climate change” regardless of how it is defined.
Weaker targets for 2020 increase the risk of serious impacts, including the crossing of tipping points, and make the task of meeting 2050 targets more difficult and costly.
Authors include: Katherine Richardson, Will Steffen, Hans Joachim Schellnhuber, Diana Liverman
April 2009
Climate chaos predicted by CO2 study
“If we continue burning fossil fuels as we do, we will have exhausted the carbon budget in merely 20 years, and global warming will go well beyond 2C,” said Malte Meinshausen of the Potsdam Institute for Climate Impact Research in Germany, who led the study, published in Nature.
More pre-Copenhagen – September 2009
A safe operating space for humanity
https://www.nature.com/articles/461472a#author-information
Authors include:
Rockström, Johan
Steffen, Will
Lenton, Timothy M.
Schellnhuber, Hans Joachim
Hansen, James
Liverman, Diana
Richardson, Katherine
Anthropogenic climate change is now beyond dispute, and in the run-up to the climate negotiations in Copenhagen this December, the international discussions on targets for climate mitigation have intensified. There is a growing convergence towards a ‘2 °C guardrail’ approach, that is, containing the rise in global mean temperature to no more than 2 °C above the pre-industrial level.
Now Only Two Years Left
July 2017 – “Three years to safeguard our climate”
http://www.stockholmresilience.org/research/research-news/2017-07-02-three-years-to-safeguard-our-climate.html
Johan Rockström, Christiana Figueres, Hans Joachim Schellnhuber, Gail Whiteman, Anthony Hobley and Stefan Rahmstorf
They will never give up as long as the funding is there.
They are a dearh cukt like Pol Pot’s Khmer Rouge ir Jonestown’s Jim Jines.
Only much more dangerous since they are lustened to by Popes and Presidents.
Yet there is no such thing as the “Anthropocene”, according to geologists who are in charge of naming geological periods.
“Fundamental societal changes.”
Natch!
Once we have built world socialism, the problem disappears.
Yep, we will never hear about climate change again after they force the world back into a feudal system where they enjoy a life of luxury while everyone else lives in abject poverty.
Feudamental change!
I’d give you a +10, if I could, Theo!
Yes, but they won’t need that many slaves, humans are inefficient and obsolete
Who says they’re keeping us? Skeptics will be the first cohort of worthless eaters.
Plague will carry off a lot of people. Drought and plague go together.
Still need enough for diversity in the gene pool, and they give that number right on the Georgia guidestones. Something like 10% of today’s population.
And keep all the fossil fuels for themselves!
Socialists want feudalism?
Shockingly, you miss the point Ryan. The Soviets called their regime the workers’ paradise, but it was anything but that. The party apparatchiki were functionally the lords of the manor. The proletariat were the peasants. But since it was mandated to address each other as comrade, rather than to acknowledge the reality that the party had absolute power exceeding the tsar, you want us to think that the analogy to feudalism is absurd. Or have I misrepresented your view?
Yeah. All cities will become like Leipzig, 1989, the most polluted city in the east block.
Rather an alarming prospect considering the great success of that filthy oil-rich state Venezuala, that can’t put food on the supermarket shelves despite being resource rich!
Note that watching “Hunger Games” gives you a true example of the elite mindset. I found the films engrossing, but the message was a lot different than what they thought they were pitching when they wrote the scripts.
“… there is a risk of Earth entering what the scientists call “Hothouse Earth” conditions.”
Just like it has happened many times before, right?
The last Hothouse Earth episode lasted from the Cretaceous Period through the first two epochs of the Paleogene Period. Life was good. Animals, plants and fungi large and thriving. Except for that unfortunate celestial event at the end of the Cretaceous.
Or fortunate if you’re a mammal.
And…interestingly during none of those instances did the temperature “run-away”. Well, if it did it didn’t run too far because it seems to have run off in the other direction until it found its way back 🙂
Runaway arises when they try and explain Venus within the misappropriated contexts of feedback and amplification.
If Venus is runaway anything, it’s runaway cloud coverage. Its clouds are thermally disconnected from the surface, unlike Earth clouds via the water cycle. As a result, Venusian clouds are in an independent thermal equilibrium with the Sun and once a temperature is established for the cloud top, the temperature at the bottom of the atmosphere at 90 bar is dictated primarily by pressure and not the GHG effect. Of course, the GHG effect is still present between the Venusian cloud tops and space.
I did some simple number crunching a few years with Charles and Boyles laws and discovered that if Earth’s SLP was the same as Venus’s surface pressure we would be only about 40deg F cooler than Venus. That 40deg can be accounted for solely by its proximity to the sun. I.e. the CO2 on Venus has nothing to do with its temperature, and there is no danger of runaway heat on earth.
I notice the warmistas deliberately suppress the information that for over 70% of the history of the earth the mean temperature of the Earth was over 80F (27C)-16deg C above the current mean!! If life wasn’t ended by the heat then it won’t be ended by a measly 2 deg C change now!
‘over 70% of the history of the earth the mean temperature of the Earth was over 80F’ If you don’t count temperatures during ices ages.
No, even the Ice Age temperatures count. Has only taken up the last 1 million to 2.3 million years (depending on whose research you check), with an interstadial thrown in every hundred thousand years or so for the last million years. And the age of the Earth is how many billion years? So, yeah, 70% of the time on this old Earth has been smokin’ hot!
And they attempt to explain away disconnects with paleo temperature change and CO2 concentrations on Earth by invoking the conveniently dynamic faint sun hypothesis. It’s just ignored that the faint sun hypothesis is paradoxical to empirical data, and is also contradicted by independent studies from several disciplines.
There is also a problem with Mars.
It is thought that Mars had running water many billions of years ago, but this was when the feint sun is said to exist.
If the feint sun causes problems explaining then past climate of planet Earth, just think about how these problems are exacerbated when considering the early evolution of Mars.
The sun always feints when it’s going for the hoop.
The sun was faint when it was young. 🙂
That’s why they had to get rid of the Medieval Warm Period, the Roman Warm Period, the Minoan Warm Period, and the Holocene Climatic Optimum. During the present interglacial the temperature has been warmer than now during ten warm periods. link We haven’t seen evidence of any tipping points. The projected temperature increase keeps shrinking. The chances are that we’re not going to see temperatures we haven’t already seen. The probabilities of a tipping point are around the same as the probabilities that my cat repels dragons.
But Bob, we are living in a new era, the Adjustocene. We are just imagining that we read about those Periods. What we have to do now is show proper horror at the new temperature regime. And if the dear leaders don’t think we are showing the proper emotion towards ‘ climate change’, well it’s a stadium full of people and a few antiaircraft bullets to the head for you.
Welcome to the new Orwellian world.
How many dragons have you seen around your house, cB?
There are zero dragons in the neighborhood and zero maidens have been devoured since we started keeping a cat.
See there, it works!
Unprecedented sorry.
”Just like it has happened many times before, right?”
“Just like it has happened many times before, right?”
Extremely unlikely to happen irrespective of CO2 level. The last hothouse ended when Antarctica became thermally isolated and the oceans changed to icehouse conditions (=high latitude deep water production). It won’t return until Antarctica moves away from the Pole, or a continent or island chain interrupts the circumpolar circulation.
Anthony, Was it you that said the current temp was rising at the rate of 0.17C per decade? if so was that based on UAH for July 2018?
Anthony,
I had the same question as Alan Tomalty.
What are the decadal increases in temperature asserted by-
NASA GISS,
Hadcru,
RSS,
UAH?
And what do the Sea Temperature records indicate as the decadal increase?
I thought Karl’s “ pause buster” paper was asserting 0.11 degrees C per decade against a lower Argo buoys recording.
UAH Latest and Greatest is +0.128 C/decade. That’s TLT, of course.
A Shout Out to Roy Spencer and team for updating the data sets so quickly this month.
No WUWT article on the UAH temperature for July ??
“… may trigger other Earth system processes, often called feedbacks …”
Apparently he doesn’t realize that the wildly inflated effect claimed to arise from CO2 emissions already requires an absurdly large and physics defying amount of feedback.
And nothing other than human-produced CO2 can trigger all these feedbacks???
“trigger”
Get it? Anything can be a trigger.
We need a CO2 safe space.
Where are my crayons and kittens?
All I need is a CO2 Fire Extinguisher to afford a safe space when the need arises. Plus, it’s a great way to chill my beer. 😉
Triggered?
What the international team of … “scientists” … mean to say is, “Avoiding this scenario requires elimination of human actions from existence altogether, thus acting as good stewards of the Mother Earth system.”
Homicide on a mass scale is just good for the planet. Every time we hear of a mass shooting, therefore, we should be thankful that some lone gunman has acted in the interests of Mother Earth. Likewise, every war is a blessing. Drunk driving is of great value in reducing human numbers.
The more killin’, the better. Starve out the poor. Impose “carbon taxes” so high that Chinese and others in the … “hottest heatwaves ever” .. cannot afford to pay for energy to run their air conditioners. Stop raising livestock in China, despite massive increased demand for meat — Jus’ keep ’em eatin’ rice and those other viddals ov’ ‘air, while those of us in ALREADY developed nations slurp down our steaks and drive our SUVs and stuff. We were here first, so other countries be damned.
More killin’, less grillin’. Off to make the T-shirt now.
It’s quite disturbing reading the Guardian. It’s funny how a lot of commenters, who call for massive reduction in human numbers, never seem to include themselves or their loved ones in the ‘cull’. They seem to think it will be the ‘bad’ people, like conservatives, who should go. True evil, everyday, in the Guardian.
Dr. “John” Schellnhuber got his CBE personally from the Queen in 2004 at the Berlin Embassy, for exactly that- getting rid of 5 billion people. The Guardian pales to farce beside such high crimes.
Not Conservatives, it is all the have-nots of the world they want to eliminate, because if they join the haves the world will die!! (racism by any other name is still racism)
Avoiding this scenario requires a redirection of human actions from exploitation to stewardship of the Earth system.
Sounds like nonsense put out by a post-modern generator:
http://www.elsewhere.org/pomo/
How badly had the “Hot House Earth” run away the last time it was 6 °C warmer?
Seems it didn’t run away too far or too long because Earth is obviously at a lower temperature now than then.
Perhaps you should read the paper. It states that:
“After peak warming, transient changes in alkalinity balance following the dissolution of deep-sea carbonates (on about a 10,000-year timescale) and silicate weathering (on about a 100,000-year timescale) would eventually reduce the global mean surface temperature back to pre-industrial levels”
So in other words these C-rate science activists think that those two slow variables are the only feedbacks in the system, and a change of a few tenths ppt CO2 will overwhelm sea floor spreading rate, geographic arrangement of ocean basins and continents, as well as orbital forcing?
There is no evidence that warmer temps will cause dissokution of carbonates.
Excellent points, Anthony. I think you mean Stockholm Resilience Center, not Copenhagen.
Did you mean, as in “Stockholm Syndrome”?
Speaking of dominoes, the whole CAGW edifice is like a house of cards; take one out of the bottom, and it all collapses in on itself.
I think you’re referring to civilisation there Bruce.
Civilization is quite robust.
Unlike climate science.
Are you trolling me or feeding me?
He is beating you over the head with a fact-mallet.
You are too low input to notice.
Didn’t notice any facts in his post, what were they? Oh I see, you don’t know the difference between facts and opinions.
Summer and seasonal heatwaves are a crisis that “you never want to go to waste”, just like winter polar vortex, and floods, and droughts. It’s Rahm Emanuel Climate Science by design.
Haven’t any of these guys ever been told the story of the boy who cried wolf, or chicken little?
How many bad predictions can a group get away with?
They weren’t paying attention then either.
It’s 2019 funding season, combined with sunshine in it.
“In the context of the summer of 2018, this is definitely not a case of crying wolf, raising a false alarm: the wolves are now in sight,” said Dr Phil Williamson, a climate researcher at the University of East Anglia.
Look at itger religions and their false contrived claims.
Humans have a huge appetite for scary stories.
told the story of the boy who cried wolf
Thing is nowadays, insane as it is, you can get paid handsomely for crying wolf, if you cry it loud & often enough.
In a few days high from the south will cause very low minimum temperatures in Australia.
https://earth.nullschool.net/#2018/08/10/2100Z/wind/surface/level/overlay=temp/orthographic=-231.62,-26.85,1137/loc=119.451,-31.735
ren
Also have a look at windy.com where you can choose a local forecast.
https://www.windy.com/-31.953/115.860?rain,2018-08-10-12,-38.135,136.802,4,i:pressure,m:cLTajoh
Thanks Philip for the windy.com link, I hadn’t seen this one before.
Here’s a good radar website for North America:
http://content.wdtinc.com/clients/koln/map2.php?MAPID=14116
“Brief Introduction to Stratospheric Intrusions
Stratospheric Intrusions are when stratospheric air dynamically decends into the troposphere and may reach the surface, bringing with it high concentrations of ozone which may be harmful to some people. Stratospheric Intrusions are identified by very low tropopause heights, low heights of the 2 potential vorticity unit (PVU) surface, very low relative and specific humidity concentrations, and high concentrations of ozone. Stratospheric Intrusions commonly follow strong cold fronts and can extend across multiple states. In satellite imagery, Stratospheric Intrusions are identified by very low moisture levels in the water vapor channels (6.2, 6.5, and 6.9 micron). Along with the dry air, Stratospheric Intrusions bring high amounts of ozone into the tropospheric column and possibly near the surface. This may be harmful to some people with breathing impairments. Stratospheric Intrusions are more common in the winter/spring months and are more frequent during La Nina periods. Frequent or sustained occurances of Stratospheric Intrusions may decrease the air quality enough to exceed EPA guidelines.”
http://www.cpc.ncep.noaa.gov/products/stratosphere/strat_int/
“very low minimum temperatures in Australia”
Thanks ren… not !
I much prefer summer, y’know !!
It’s a high ren, we get one every week or two. This one will bring a cool snap, but nothing unusual – certainly nowhere near record. Its called weather, what’s your point?
Now that’s funny. Just a few days ago you and your fellows were proclaiming how a heat wave is proof of global warming.
Now cool waves are just warming.
Typical hypocrisy that we have come to expect.
They also don’t understand the fundamental difference in the climate/’weather argument. Observations of hot weather constitute ‘white swan’ events. Given that we are supposed to be warming, aren’t more extreme cold weather events more akin to a ‘black swan’ event. Or is my reasoning wrong?
Dominoes?
Keep in mind T^4.
The “Copenhagen Resilience Center”? Don’t they make those expensive mattresses? 😉
I think they must be talking about the Tivoli. I once spent a pleasurable day there which improved my resilience no end. Forgot against what.
I just read about this on the bbc and found none of it new, informative or helpful. It seams they’re trotting this out because of the heatwaves.
How many seams does a heat wave have?
Don’t forget your /pedantic nazi tag.
Don’t remove that tag — under penalty of law. 😉
And despite the non-stop hysteria, the BBC still can’t risk allowing comments.
Oh it has comments now and they are insufferable. The same tired “were overpopulated” argument repeated over and over again
The BBC article
https://www.bbc.co.uk/news/science-environment-45084144
acknowledges there are sceptical views in ONE sententence then goes on to list a bunch of alarmists’ quotes.
In other words, they don’t have a clue and it’s another “study” to keep the crime going and the money coming in.
Alarmism at its worst… Global temperatures and atmospheric CO2 _are relatively low now, was some 6 deg C higher 9000 years ago..
HotHouse earth, huh? I think I will keep a cold beer at the tipping point, and occasionally over-tip it.
there’s no such thing as run away global warming….
The question they can’t answer is why does it stop and go the other way
“Maintain a ‘Stabilized Earth'”
yep – till where I’m sitting here in Indiana is back to it’s more normal climate state of being under 1 mile of ice.
These people really are clueless and believe their silly pontifications.
“Maintaining a stabilized Earth” you must understand may require something similar to the ‘normalization of the situation’ as was comrade Brezhnev’s characterization of Soviet tanks rolling into insubordinate Czechoslovakia in 1968, which KGB defector Yuri Besmenov clearly explained over 3 decades ago along with so much else of his own former participation in concerted efforts to gradually undermine the west at:
https://www.youtube.com/watch?v=0wakec06NlA .
The previous interglacial period, the Eemian, was warmer than this one with more ice cap melting and higher sea levels yet none of these tipping points happened. Based on the paleoclimate record and the work done with models, one can conclude that the climate change we have been experiencing is caused by the sun and the oceans over which mankind has no control. Despite the hype, there is no real evidence that CO2 has any effect on climate and plenty of scientific rational to support the idea that the climate sensitivity of CO2 is zero, If the future is anything line the past warming and cooling cycles will continue and longer term warm periods and cooler periods will continue as the current interglacial period gradually ends and the new ice age gradually begins to develop. The whole process will take tens of thousands of years and mankind does not have the power to change it. At best all we can do is adapt to the gradually changing climate. This is all a matter of science.
“gradually changing climate” I hope that it remains gradual. There is strong evidence that the change from relatively warm interglacial to full-blown glacial conditions can occur in less than 50 years and vice versa. If we did have such a disaster, I guarantee the “watermelons” would still say CO2 is to blame and we must fundamentally change society.
But they wouldn’t be out marching in 10ft of snow, making a racket in their pink tw@t hats.
The interesting thing to me is that glacial periods last between 90-130,000 years, & interglacials appear to last only 10-12,000 years +/-. The current Holocene started around 11,500 years ago, suggesting that we may be living on borrowed time!!!!!
I agree the change coming out of an ice episode into an interstadial can be as rapid as 50 years, maybe as rapid as 10 years, decline back into an ice age seems to take much longer, with fits and starts thrown in for good measure. And I’m too tired right now to look up and link to those graphs.
I thought this was the most stupid statement I’d ever heard:
“What we are saying is that when we reach 2 degrees of warming, we may be at a point where we hand over the control mechanism to Planet Earth herself,” co-author Prof Johan Rockström, from the Stockholm Resilience Centre, told BBC News.
Until I read the next sentence, which topped it:
“We are the ones in control right now, but once we go past 2 degrees, we see that the Earth system tips over from being a friend to a foe. We totally hand over our fate to an Earth system that starts rolling out of equilibrium.”
Giving new meaning to “Stockholm Syndrome”.
Yeah, those are great quotes. Very sciencey. NOT !
Looks like a massive ego.
When it’s good, we did it. When it bad, you did it.
That is great news.
After 50 million years of slow decline, the planet is finally returning to normal temperatures. That mutation in those tailless apes that allowed them to choke while eating seemed like a stupid gamble at the time. But the ability to sing turned out to be beneficial in the end. Now if those apes will just re-open the Suez and the Nicaragua straights, then the deep oceans can regain a bit of heat.
/s
To be sure to reach a Hothouse State you need to reallocate the continents, you need to warm all deep oceans with some 5 degrees Celsius or more and you must reverse the main oceanic circulation:
https://wattsupwiththat.com/2018/06/15/how-the-earth-became-a-hothouse-by-h2o/
We are living in a short warm interval within the coldest period of nearly 300 million years. All of our deep oceans are filled with ice cold water, just some degrees above zero. 95% of the 1.3 billion cubic kilometres of ocean water is ice cold. Some more wind during a longer period is enough to get [more of ] the cold water to the surface to restart the next cold period. ‘Man’ does not control wind.
https://wattsupwiththat.com/2016/12/26/warming-by-less-upwelling-of-cold-ocean-water/
https://wattsupwiththat.com/2017/01/26/warming-and-the-pause-explained-by-wind-upwelling-and-mixing/
Yup, to have a Hothouse Earth, you need precisely the things of which we now have so few, such as many shallow, epicontinental seas (of which there are even fewer during glaciations), lots of water vapor at high latitudes, globe-circling tropical oceanic currents and thermal expansion of the oceans from more active seafloor spreading volcanism and physical expansion from underwater mountain building.
And flatulent gigantic sauropod dinosaurs or slightly less giant rhinos. (Just kidding.)
Hmm. I wonder what the atmospheric methane levels were 65 million years ago?
The Earth doesn’t care a rat’s fart about Methane.
I always like the research that indicates that even if we followed the Paris agreement that this is not enough to avoid climate Armageddon. The inevitability and the confidence of that occurrence means that the proper action is not to decarbonise further but to stop all programs and use those funds to enjoy life and make our last days of existence as comfortable and as enjoyable as possible. Global warming disease is like a cancer, after traditional efforts don’t work one progresses to experimental nutcase solutions. The problem is that you still die but the kids inheritance is severely damaged. Once things are inevitable and action is futile it’s better to enjoy your last days as comfortable as possible and leave as much of your wealth as you can to your kids. Unfortunately the quacks who benefit on the gullibility of humans will always try to con the naive and desperate out of their hard earned fortunes.
Any suggestions by warmists that tipping points are passing that it’s now too late are the signs to me to put things into palliative care. Futility make any expensive actions unnecessary.
Oh the wonders of TheMagicMolecule™!
Where any claim can be validated by invoking its mystical powers.
They know there are tipping points all around us. Why? Because they say so. They wrote a “study” with a figure showing the Earth with arrows and names of things all over the place. It must be true.