Team Deciphers Sea-Level Rise From Last Time Earth’s CO2 Was as High as Today

Interesting find but the article is somewhat lacking in substance. For instance they say "Scientists have discovered evidence in a coastal cave off Spain showing that more than 3 million years ago, when temperatures were roughly equivalent to those projected for the end of this century". I've seen lots of predictions so it's unclear which one they are talking about and how realistic those predict temperatures are.
They do however mention how much land masses have shifted over 3 million years so it's unclear if the dramatic rise in sea level of "16 meters higher than they are now" is at all relevant.
I think the article is attempting to create the illusion that temperatures such as those 3 million years ago will lead to dramatic sea level changes but IMO they fall far short of this and instead what this proves is yes indeed earth has been very warm before all by itself with no help from man's C02. If the article is attempting to incite fear it failed, with me anyway. Others I'm sure will start building arks.

"Scientists have discovered evidence in a coastal cave off Spain showing that more than 3 million years ago, when temperatures were roughly equivalent to those projected for the end of this century, sea levels were as much as 16 meters higher than they are now. While levels are not expected to rise that fast by 2100, the findings have significant implications for predicting the pace of near-term and future sea levels amid a warming climate, say the researchers."
"The analysis of deposits from Artà Cave on the island of Mallorca in the western Mediterranean serves as a target for future studies of ice sheet stability, ice sheet model calibrations and projections of future sea level rise, they said."

https://blogs.ei.columbia.edu/2019/08/30/team-deciphers-sea-level-rise-earth-c02-was-high-as-today/

 

Everything is speculation...we will "know" when it happens, not before.

 

Of course they use a model to correct for land elevation 3 million years ago. Do these people ever do any kind of sanity check on what they actually are saying ??

 

Is there any evidence in your article that CO2 had nothing to do with any of this historical warming? How does the planet once being warmer in the past prove that CO2 had nothing to do with that warming or today's warming?

 

I draw no conclusion except earth has been this warm and warmer long before industrialization and even long before man for that matter, well homo sapiens anyway. If you read the article you'll find C02 levels were also very high then which could be used by warmers to say see, C02 caused global warming. On the other hand many say warming caused C02 so either case could be argued here.
I found the predicted sea level rise interesting because there million years ago earth was ice free and I don't think we have enough ice left on the planet to raise sea levels that much today. Plus there's the different land mass structure then and now to consider. Seems like the article is grossly exaggerating potential sea level rise in order to create hysteria would be my main takeaway.

 

Yesterday’s nine Holocene warming and cooling periods occurred with no CO2 changes.

Today’s warming started with no CO2 increase. Today’s warming is unremarkable with regard to previous Holocene warming periods. Today’s warming is no different from the 30’s warming at much lower CO2 increases. There is no proof that CO2 increases today have a significant effect on global warming.

 

There have been many occasions where the planet has been much warmer in the past. In fact, during the dinosaur era it was so hot that Central America and Florida were complete underwater, the US was a big desert, and sea levels were so high that these was a shallow sea covering the Great Planes. The dinosaur era had CO2 levels that were 5 times higher than today and was very hot and humid. Scientist believe this was due to intense volcanic activity releasing CO2 when the super-continent Pangaea was splitting up. The sun was cooler during this era, and since CO2 magnifies the heat of the sun, it took more CO2 to do as much as less CO2 does today with a warmer sun.

We have enough ice to raise sea levels by 20 feet if the arctic melts, and 200 feet if the antarctic melts and sea levels were much higher when we were ice free.

 

CO2 followed warming.

How long will it take to melt all that ice at the consensus global warming rate of 0.03 degrees Centigrade per year ??

 

Previous warming and CO2 are correlated in the Holoscene:

From this graph its obvious that CO2 has been increasing throughout today's warming.

That is true, just like human buildings are unremarkable compared to mountains that took millions of years to form. The Holoscene warming took place over a much larger time frame than today's warming.

Today's warming was about .8 C from the mid 1970s while the warming around the 1930s was about .4 C.


Also, the sun was warming significantly during the 1930s and helped out CO2. While today, the warming is happening without any help from the sun:

You are correct there is no proof that CO2 is behind today's warming. That is because science deals with inductive evidence not deductive proof.

 

CO2 followed warming because its a positive feedback. The sun warms, which releases CO2 which causes more warming. I don't know how much warming it will take to completely melt the Antarctic.

 

CO2 lags temperature. Read your graph.

The graph of CO2 is a great example of how to lie with statistics.

There were 9 warming and subsequent cooling Holocene periods. The last three have bee the Medieval, Roman, and Minoan. Where are they on your graph ???

The slopes are the same.

The last chart is another example of how to lie with statistics. Look at it closely.

 

BS. Warming resulted in more plants.

It will take thousands of years.

 

In some places warming will result in more plants. Like cold places. In warm places the heat will kill plants.

Warming can happen over many different time periods. Warming trends can happen over hours, days, years, centuries, thousands of years, or millions of years.

 

It certainly does. Usually initial warming will release CO2 that causes more warming.

I can assure you that the graph is completely accurate.

My graph was only over the modern warming since 1850. Here are several studies of the last 2000 years.

Due to help from the sun in the 1930s we didn't have today.

Took another look. Checked out to me. Maybe I need glasses.

 

The Holocene is ~ 10,000 years.

 

Interesting comment. Where are you getting this estimation?

 

I think we agree insofar as a greener world produced more C02

 

Temperatures over the last 10,000 years:

 

Again we agree. Warming will shift plant growth but I'm not sure we agree on volume. Would you agree a warmer planet in toto increases plant growth?

 

Right here:
https://nsidc.org/cryosphere/quickfacts/icesheets.html

 

It takes a lot of heat to destroy plants. I have seen them growing in very warm conditions.... Like under plastic or glass in full Alabama sun. Lack of water will kill them faster. And warmer temps destroy organic matter in soils .... therefore reducing water holding capacity in said soils. And adding more carbon to the atmosphere as it breaks down.

 

More ice left on this planet than I thought if that estimate is anywhere near correct

 

Think about it this way. The average depth of the ocean is 12,100 feet. The arctic (mostly greenland) has enough ice for 20 feet. That about a .165% increase. The antarctic, basically an ice continent has 200 feet is a 1.65% increase.

We are still in an ice age period called the quaternary glaciation that has been going on for the last 2.6 million years and have plenty of ice that needs melting.

 

I guess it depends on the crop we are talking about, how hot the location is initially, and how much it warmed. The most important thing is that the plants get proper water.

 

Well NASA disagrees. Overall there is a net decrease plant productivity but China will win from this initially. Maybe we won't get hurt too bad with 2-4 degrees but I'm sure there will be a lot of droughts if we approach 10 degrees.

https://www.nasa.gov/topics/earth/features/plant-decline.html