98% of the earth's surface is hotter now than at any time in the past 2000 years

This is according to a new study published in the journal, Nature, titled "No evidence for globally coherent warm and cold periods over the preindustrial Common Era". I read about
this subject at the carbonbrief.org website.

The study uses 51 year period averages and the map on the right shows 1 white square near the bottom, left of center, where the earth was warmer around 2000 years ago and a few red and white squares where the earth was warmer in the past - mainly parts of Antarctica. Everywhere else the planet's surface was warmer in the late 20th century.

During the Medieval Warming anomaly only 40% of the earth's surface experienced warming at the same time. During the "Little Ice Age" the cooling was very much a regional
phenomenon with some areas cooling while other regions were warm. The Roman Warm Period was also very regional.

This study is consistent with previous studies showing that past warming and cooling periods were regional, primarily, and that the mean global temperature during the
Medieval Warming Anomaly was similar to the middle 20th century. It is strong
evidence that the current warming is not natural.


Maps showing the pattern of warming in the Roman Warm Period (left), Medieval Climate Anomaly (middle) and the Current Warm Period (right). On the maps, colour is used to illustrate the timing of the hottest 51-year period for each location. Source: Neukom et al.
2019)

 

The climate curve looks like a “hump”. At the beginning of the Holocene – after the end of the last Ice Age – global temperature increased, and subsequently it decreased again by 0.7 ° C over the past 5000 years. The well-known transition from the relatively warm Medieval into the “little ice age” turns out to be part of a much longer-term cooling, which ended abruptly with the rapid warming of the 20th Century. Within a hundred years, the cooling of the previous 5000 years was undone. (realclimate.org, Paleoclimate: the End of the Holocene)

The cooling trend over the past 5000 years until the 19th century has been the result of the earth's axial tilt becoming more upright and less incident solar radiation at the poles
during the summer.




Figure 1 Blue curve: Global temperature reconstruction from proxy data of Marcott et al, Science 2013. Shown here is the RegEM version – significant differences between the variants with different averaging methods arise only towards the end, where the number of proxy series decreases. This does not matter since the recent temperature evolution is well known from instrumental measurements, shown in red (global temperature from the instrumental HadCRU data). Graph: Klaus Bitterman. from realclimate.org

 

Made up numbers put into a pretty looking graph. Completely useless.

It is not possible to measure the temperature of the Earth. We don't have near enough thermometers to even begin such a statistical analysis. We have no idea whether the Earth is warming, cooling, or staying the same...

 

In fact, real numbers factually describing what is happening real time, and the nay sayers say 'nay'

 

To: gfm

I don't know if you are serious. How can I take your statements seriously? These are opinions not based on any evidence: "made up numbers", "completely useless (graph)", "no idea whether the Earth is warming, cooling ...".

We know that the earth is warming for many reasons. I think that humans could infer that without any thermometers. Certainly the oceans are warming and that is where about 92% of the energy
imbalance goes. There are several different ways that we can determine that the oceans are warming and only 1 involves the use of thermometers.

I know that there are significant errors in the proxy data but I would not agree that all of the proxy data is useless. I doubt if you are more qualified than the scientists performing
this analysis to render an opinion that anyone should value.

 

Interesting how as one person after another that post only on global warming goes there is suddenly a new one to take their place. This is your fourth incarnation since I've been here. Why do you do this?

 

I have only had 1 identity since I have been here, "skepticalmike".
What ever happened to "iamanonman"? I suspect it was frustration from an inability to persuade the climate science deniers. Maybe boredom too. That person was the best representative for climate science
on this site.
It is easy for me to understand the high turnover rate - we all reach a point where we get frustrated or run out of things to say. It is also very time consuming.
Why do I do this? It is for the same reason that "iamanonman" did it. It is out of an interest in climate science and a need to rebut climate misinformation. Even if I can't persuade very many
people, I can learn about a subject that I am interested in during the process. ,I only post on global warming because most of the other subjects aren't interesting and this one subject consumes a lot of my time.

 

Funny how you knew exactly who I was talking about but you supposedly just got here.

 

I am flattered by your remarks. Didn't you find "iamanonman's" arguments convincing? If "iamanonman" couldn't convert others then what hope is there for me?

I will have to do a lot of studying on climate science to attain the knowledge of that very well educated individual. I don't know if I am up for the task.

I have been away from all forums for around 6 months. My life was much more peaceful then. My heart rate and blood pressure have risen about 10%

recently and I have insomnia. That is why I have to take a periodic break from this.

 

Do not take it personally as it is sadly common in these discussions to witness those with limited or dishonest knowledge base revert to personal attack when confronted. Climate science is only complicated in the details but quite straight forward in the base concepts and the data is pretty easy to access and comprehend. Denial of the obvious is the standard tactic and merely indicates the individuals to bypass when seeking information.

 

What did they use to measure the Earth's temperature two thousand years ago?

 

Temperature proxies and glacier ice.


Map of “climate proxies” used in the new study, including bivalve molluscs such as clams, oysters and mussels (purple dots); coral (orange dots); glacier ice (blue diamonds); hybrid – trees or boreholes (black star); lake sediment (blue square) and trees (green). Shading on the map illustrates distance to closest proxy record. Source: Neukom et al. (2019 (From carbonbrief.org)

 

Since you just got here how do you know so much about him? Maybe because you are him? Some kind of split personality thing here?

 

The only real numbers are from the US over the last century. The natural history of the globe is real. How is it possible for alarmists to discount history so easily and irrationally ??? The alarmists went wild over the Mann hockey stick because it “eliminated” the Medieval Warm Period. Completely dishonest behavior.

 

There is no data proving a causal relationship between global average temperature (which is a joke to begin with) and increasing atmospheric CO2.

Climate science is chaos theory.

 

Mann is a fraud and liar.


Hockey Stick Broken! “Scientist” Michael Mann Loses in Court, Forced to Pay Court Costs — Global Warming Hoax Hit Hardest

 

How would one go about having their thermometer calibrated 2000 years ago?

 

So Soon says that you're wasting your time. He's a world renowned scientist. And you are who again?

 

I take no "study" serious, whose researchers are funded by MMGW special interest groups

 

Whoopsie....

 

Rock handled Brontasaurus bone thermometers, of course. Haven’t you watched the Flintstones?

 

The USCRN was designed specifically for scientific measurements as opposed to the other record which is often done by armature enthusiasts or from stations located near heat sources. Since it started in 2005 it shows no warming since 2005 so all those yahoos that claim they can tell the difference are just spouting nonsense.

 

And the US data is the only reliable data series. ^^^^

 

The only warming shown is from urban heat island corrupted data and ocean SST data.

 

And when it gets real hot the bone marrow shots through the top of the bone.