No Global Warming Harm Here: 4Yr Old Neglected Mandarin Orange Tree bursting with fruit, growing on the southern edge of the tropics.

Study: Global Warming Restricting Agricultural Productivity

Guest essay by Eric Worrall

Ariel Ortiz-Bobea, an economist at Cornell University, claims all the CO2 and global warming we have added to the atmosphere is harming plant growth and agricultural yields, and we are only keeping up because of better farm practices. But how does Ariel explain the global greening of wilderness regions observed by NASA?

Rapid global heating is hurting farm productivity, study finds

Research shows rising temperatures since 1960s have acted as handbrake to agricultural yield of crops and livestock

Oliver Milman@olliemilman
Fri 2 Apr 2021 02.00 AEDT

The climate crisis is already eating into the output of the world’s agricultural systems, with productivity much lower than it would have been if humans hadn’t rapidly heated the planet, new research has found.

Advances in technology, fertilizer use and global trade have allowed food production to keep pace with a booming global population since the 1960s, albeit with gross inequities that still leave millions of people suffering from malnutrition.

But rising temperatures in this time have acted as a handbrake to farming productivity of crops and livestock, according to the new research, published in Nature Climate Change. Productivity has actually slumped by 21% since 1961, compared to if the world hadn’t been subjected to human-induced heating.

“The impact already is larger than I thought it would be,” said Ariel Ortiz-Bobea, an economist at Cornell University who led the research.

“It was a big surprise to me. The worry I have is that research and development in agriculture takes decades to translate into higher productivity. The projected temperature increase is so fast I don’t know if we are going to keep pace with that.”

The abstract of the study;

Anthropogenic climate change has slowed global agricultural productivity growth

Ariel Ortiz-BobeaToby R. AultCarlos M. CarrilloRobert G. Chambers & David B. Lobell 


Agricultural research has fostered productivity growth, but the historical influence of anthropogenic climate change (ACC) on that growth has not been quantified. We develop a robust econometric model of weather effects on global agricultural total factor productivity (TFP) and combine this model with counterfactual climate scenarios to evaluate impacts of past climate trends on TFP. Our baseline model indicates that ACC has reduced global agricultural TFP by about 21% since 1961, a slowdown that is equivalent to losing the last 7 years of productivity growth. The effect is substantially more severe (a reduction of ~26–34%) in warmer regions such as Africa and Latin America and the Caribbean. We also find that global agriculture has grown more vulnerable to ongoing climate change.

Read more:

Back in the real world, NASA reports that not only is the world greening thanks to anthropogenic CO2, the extra vegetation is exerting a strong cooling effect on the surface of the planet.

A new study reports that increased vegetation growth during the recent decades, known as the “Greening Earth”, has a strong cooling effect on the land due to increased efficiency of heat and water vapor transfer to the atmosphere.

A new study published in the journal Science Advances titled “Biophysical impacts of Earth greening largely controlled by aerodynamic resistance” reports that the entire land surface would have been much warmer without the cooling effect of increased green cover during the recent decades. The study used high-quality satellite data from NASA’s MODIS sensors and NCAR’s state-of-the-art numerical earth system model.

Satellite observations show widespread increasing trends of leaf area index (LAI), known as the Earth greening. However, the biophysical impacts of this greening on land surface temperature (LST) remain unclear. Here, we quantify the biophysical impacts of Earth greening on LST from 2000 to 2014 and disentangle the contributions of different factors using a physically based attribution model. We find that 93% of the global vegetated area shows negative sensitivity of LST to LAI increase at the annual scale, especially for semi-arid woody vegetation. Further considering the LAI trends (P≤0.1), 30% of the global vegetated area is cooled by these trends and 5% is warmed. Aerodynamic resistance is the dominant factor in controlling Earth greening’s biophysical impacts: The increase in LAI produces a decrease in aerodynamic resistance, thereby favoring increased turbulent heat transfer between the land and the atmosphere, especially latent heat flux.Credits: Chi Chen

The greening of the lands during the first fifteen years in the 21st century represented an additional heat dissipation (2.97×1021 J) from the surface equivalent to five times the total energy produced and used by humans in 2015 (5.71×1020 J). This greening-induced cooling effect was twenty-five times stronger than the warming effect caused by tropical deforestation.

“In the fight against climate change, plants are the lonely-only defenders. Stopping deforestation and ecologically sensible large-scale tree-planting could be one simple, but not sufficient, defense against climate change.” said the lead author Dr. Chi Chen a former Ph.D. student at Boston University, now a postdoc researcher at DOE’s Lawrence Berkeley National Lab.

Read more:

Ariel seems to suggest that soaring agricultural yields are due to better farm practices overcoming the harm caused by global warming, but this does not explain the massive global greening of wilderness areas observed by NASA. Unfortunately the full study is paywalled, but surely if the underlying trend was increasing climate harm mitigated by better agriculture, only farms would be greener.

Warmer temperatures are no threat to agriculture. Even if Summer temperatures rise beyond the tolerance of some crops, the solution is plant a little earlier. Plenty of temperate climate crops are commercially grown in my district, crops which would never survive the Summer heat. The farmers in my district plant potatoes, carrots, cabbages, celery, and other temperate climate vegetables at the start of Winter, and harvest them in Spring.

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John Dueker
April 2, 2021 6:09 pm

How can Ariel Ortiz-Bobea publish nonsense and get away with it.

Michael E McHenry
Reply to  John Dueker
April 2, 2021 6:15 pm

Because science journals like Science and Nature have brought into the Climate Crisis. Also academics are they’re main source of papers

Reply to  Michael E McHenry
April 3, 2021 12:17 am

And income

Reply to  John Dueker
April 2, 2021 6:23 pm

He’s part of the scam is how.

Joel O'Bryan
Reply to  John Dueker
April 2, 2021 8:46 pm

a seeker of rent.

Reply to  John Dueker
April 3, 2021 3:10 am

Because he needs another government grant.

Reply to  John Dueker
April 3, 2021 4:38 am

“….compared to if the world hadn’t been subjected to human-induced heating.”

Lab rabbits like Ariel never step outside their comfort zone. Farming methods are much more productive now (all crops,including grains) than they were a mere 20 years ago and it has nothing – nada, zilch,zero, zip – to do with human-induced heating, which is the product of her overheated imagination.

Just out of curiosity, I wonder how she would do in a really cold climate, like one of thos Arcti Circle islands where the walruses go for haulouts. I don’t belive she’d last five minutes, but that’s just me.

Tom Halla
April 2, 2021 6:17 pm

As yields of annual crops are up by several hundred percent since the early 1960’s, a claim that AGW is causing a decrease is an untestable assertion. Claiming yields should have gone up even more is the sort of claim requiring much more rigorous evidence than she shows.

David A
Reply to  Tom Halla
April 2, 2021 7:14 pm

There is massive more evidence of CO2 benefits on crop growth then any theoretical harms from moderate warming.
There are literally thousands of studies.

More bio life.
Increased drought resistance.
Increased Frist resistance.
And in a warming world less Frost, especially as CO2 mainly caused an increase in the minimum T.
And great expanse of aerable productive land.

Sad state of affairs. Mentally ill adults with degrees.

Bryan A
Reply to  David A
April 2, 2021 8:54 pm

Now now now, if it’s in the Journal, it must be true…
Global Warming IS restricting crop production…to more and more places where it didn’t exist prior

Bryan A
Reply to  Bryan A
April 3, 2021 12:36 am

Why the -1??
Read it again

Clyde Spencer
Reply to  Tom Halla
April 2, 2021 9:20 pm

Another claim based on a model that doesn’t agree with reality. Instead of questioning their model, they make assumptions about the climate that might impact the growth rate of productivity.

Other considerations besides climate might be that as the best agricultural lands were put into production first, it would be expected that subsequent additions would not produce as much. As water available for irrigation was committed for early expansion, that left less for expanding tillage as the lower quality lands were pressed into production. There is a point of diminishing returns on the application of fertilizer, and even becoming toxic. Thus, the underpinning of the initial stages of the Agricultural Revolution has built-in limits to prevent unrestricted increases in productivity. So, there are many reasons why the very early productivity gains have not been maintained.

From the following USDA link:

Global agricultural output growth has remained remarkably consistent over the past five decades–2.7 percent per year in the 1960s and between 2.1 and 2.5 percent average annual growth in each decade that followed.

Mike Dubrasich
Reply to  Clyde Spencer
April 2, 2021 10:40 pm

Agriculture is a human endeavor, a business, has many economic variables, and is subject to markets and politics. It is not an independent environmental phenomenon that is determined or controlled by “climate” or even weather.

Farmers make ag decisions based on many factors, the most important being market demand for their crops. If you can’t sell it, why grow it?

To conflate ag productivity with “climate change” is Medieval thinking that does not comport with the modern world.

Reply to  Clyde Spencer
April 3, 2021 5:17 pm

That link appears to be research according to glorified estimates by alleged experts.

“to estimate TFP, researchers total the land, labor, capital, and material inputs used in agriculture and compare growth in total inputs with growth in total output of crop and livestock products.”

Hard to accomplish when a substantial portion of the world refuses access to their actual data; e.g. China and Russia.

Reply to  Tom Halla
April 3, 2021 1:53 am

Unfortunately this seems to be a case of finding the acceptable answer rather than the true one. The same shenanigans went on with the Lancet Countdown 2019 (I have not mustered the fortitude to read the 2020 version). Here, despite constant improvements in crop yield, the Lancet claimed that “Global Crop Yield Potential” had gone down for maize, wheat, rice and soy.

The method is to use a model to estimate how much the crops like the present climate and ignore the data on yield. I think what this might mean is that, if you believe the model, then if we revert to cultivating by hand and fertilising with animal dung, we might achieve lower yields than in 1800.

It also ignores the possibility that (shocking I know) farmers might decide to grow different crops depending on how they think they will perform.

April 2, 2021 6:22 pm

“The impact already is larger than I thought it would be”. and “It was a big surprise to me… ”

It always is for climate prognosticators.

Reply to  Dnalor50
April 2, 2021 7:07 pm

Climate liar – knew exactly what stupid-ass conclusion it was going to write.

Get a life Ariel moron. You only get one.

Last edited 8 days ago by philincalifornia
Rory Forbes
Reply to  philincalifornia
April 2, 2021 8:30 pm

With the highly refined, new science of climate, conclusions ALWAYS precede the hypothesis, accounting for the remarkably uniform results they achieve.

Reply to  Rory Forbes
April 3, 2021 6:23 am

Yep, one of the reasons the hoax became apparent to me.

As that great philosopher Billy Preston asked – “Will it go round in circles? ”

Will any climate change paper ever not go round in circles?

Rory Forbes
Reply to  philincalifornia
April 3, 2021 9:18 am

As that great philosopher Billy Preston asked – “Will it go round in circles? ”

Exactly. They not only love circular reasoning, but they’ve never found a fallacy they didn’t like. Their entire position is founded on fallacies.

Reply to  Dnalor50
April 3, 2021 5:02 am

“The impact already is larger than I thought it would be”

So you made a mistake while programming the model. Or are you extrapolating a limited data set beyond reason?
There is plenty of experience with climate controlled growing. Just ask the guy that sold you the stuff you were smoking while writing this paper. His supplier knows how to use growth lamps without giving off a heat signature.

April 2, 2021 6:29 pm

Nah, looks good

Tree cutting is an issue though. We should plant more trees.

Mike Dubrasich
Reply to  Zoe Phin
April 2, 2021 10:59 pm

Tree cutting is how you got boards to build your house. Or do you live in a mud hut?

Most (99%+) forested areas on this planet arose without tree planting. The trees seeded in all by themselves. Really. Kind of mind-blowing to urbanites, but the facts are the facts.

Two to 10 million acres of forests burn down each year in the USA. Virtually none of those acres are human-planted after burning, yet most regrow trees. In fact, in many cases more trees re-seed than are desirable. Dense thickets of new trees grow poorly due to intense competition and become high fire risks in a few years. Repeat fires are common.

To my knowledge all states have reforestation rules for harvested forestland. The landowner who cut trees must reforest by law. There’s no place for charitable do-gooders to plant trees, but if thoughts count, score one for the well-meaning-but-ignorant.

BTW, if you’re Delta Airlines and claim to be “carbon neutral” by virtue of “carbon offsets” that go to tree planting, then you’re a fraud.

Last edited 8 days ago by Mike Dubrasich
Reply to  Mike Dubrasich
April 2, 2021 11:23 pm

Mud hut. Did you see my page? There’s serious forest decrease. How could that be, if you think natural replacement is enough.

I’m actually in favor of serious water dasalinating and turning barren land into human-friendly environments: mixed tree, grass, savannah, etc. I’m not suggesting we destroy cropland or human habitat for forests.

I’m an economist, so I understand the limits of charity and the productivity of the market, thank you very much.

Alan Robertson
Reply to  Zoe Phin
April 3, 2021 12:53 am

It’s been said that there are more trees now in the United States, than at any time since Europeans arrived.
We no longer have to rely on wood for energy.

Joseph Zorzin
Reply to  Alan Robertson
April 3, 2021 3:29 am

We certainly don’t have to RELY on wood for energy- but no reason to NOT use SOME wood for energy.

Reply to  Joseph Zorzin
April 3, 2021 4:29 pm

Especially the energy required to cook large hunks of meat 🙂

Reply to  Alan Robertson
April 3, 2021 6:37 pm

Actually more trees from before the Europeans.
The East and South forests are regrown with trees planted across human developments.

Nor should one forget the population collapses caused by Europeans allowed forests to grow unchecked. Unchecked because we know the Native Americans extensively used fire to control forests.

In the Midwest, trees have been planted extensively across former grasslands.

When driving across the Western part of the USA, the first signs of human life are trees. Trees that are planted to shade housing, outbuildings and animals.

A major problem for many former waterholes are trees planted by humans. Trees that have turned waterholes into dry holes.

In other places like the Amazon, there are more trees now. The so-called virgin Amazon forests were regrown after the population collapses triggered by Europeans; e.g. disease, murder, enslavement, war…

The same goes for Southeast Asia. Areas that were city expanses and crop fields reverted to forests when the populations collapsed.

Just as forests quickly regrew after glaciers bulldozed vast areas of northern lands, trees are incredibly resilient.
Just like corals.

That boreal forest of Canada? Nonexistent while Canada was deep under glaciers. Siberia were Arctic and subarctic grassland steppes.

It is all right to love trees.
It is not all right to glorify trees while hating humans who use trees.

Trees like other crops are the ultimate in renewables, easily regrown

Joseph Zorzin
Reply to  Zoe Phin
April 3, 2021 3:28 am

“There’s serious forest decrease.” Yes, due to continued urban sprawl and the installation of huge solar “farms”- not due to standard forestry work.

Reply to  Mike Dubrasich
April 3, 2021 5:40 pm

charitable do-gooders to plant trees”

The worst part is the charitable organizations purchase easy to propagate ultra cheap trees from certain commercial growers.
Trees that have little, if any, functional usages for nature or mankind.

Most are either fast growing space fillers, e.g. Norway spruce; white pine or flowering trees. Flowering trees that if they produce fruit, produce minimal crops, e.g. dogwoods, flowering cherries, redbud.

A local to Virginia tree planting organization happily handed out northern growing trees that do poorly in Virginia.

Paper producers plant trees that produce good wood for making paper. Just like the trees they cut down. The same goes for lumber producers, wood product producers, etc.

Trees in tropical areas highlight other issues with direct tree replanting. Valuable lumber trees, e.g. mahogany are highly susceptible to pest damage when planted en masse in orderly rows.
It was discovered that replanting trees is best accomplished by leaving seed trees then allowing animal life to spread seeds naturally. Resulting in successions of ages and canopies.
Quite a few crop trees are grown in the same manner, e.g. rubber, cocoa for the same reasons.

April 2, 2021 6:47 pm

There is no sign of any ‘Rapid global heating’ and it is not doing any harm to any farm productivity. On the contrary there is clear evidence from NASA studies that increased levels of CO2 are greening the whole of the Earth. Merely denying this evidence in the interests of promoting Climate Alarmism is futile stuff.

Smart Rock
April 2, 2021 7:12 pm

More nonsense from the Bad News Factory. No new observations were made, so it’s just sciency-sounding rubbish.

Meanwhile, from the Good News Factory (a much smaller, terminally neglected and very underfunded organization) we read that “The increase in LAI (leaf area index) produces a decrease in aerodynamic resistance“. I find this statement to be at odds with common sense. More/bigger leaves speeds up air flow? Sorry, Dr. Chen, I am unconvinced; it’s just too counter-intuitive for this simple geologist (who has, however, spent a good chunk of his life in forests).

He uses this perverse theory to conclude that more/bigger leaves cause cooling due to increased air flow. What about changes in overall reflectance, leading to a higher albedo? What about increased aerosol production from forests? These are obvious sources of potential cooling from CO2-caused greening, neither of which require excursions into voodoo physics.

Just because we like his message, doesn’t mean we have to buy his devious logic.

Reply to  Smart Rock
April 2, 2021 7:52 pm

….. hey, but if he/she/it’s right though – wind turbines in forests. What could go wrong, and it creates jobs?

Reply to  Smart Rock
April 2, 2021 11:30 pm

Maybe he/she looks at in in terms of fans, like those folded fans ladies used to carry in hot weather. Bigger leaves can fan more air per leaf.

David A
Reply to  Smart Rock
April 3, 2021 10:25 am

Which is actually an interesting question. Wind energy has adequate fatal flaws as it is. Yet I am curious if wind turbines increase the residence time of energy in the atmosphere?

Pat from kerbob
April 2, 2021 7:14 pm

Models top to bottom

Actually, this is just like climate economics.

We face an existential crisis, one that means we will only be 200% richer in 2100 instead of 220% if we do noting?

So agriculture output is up massively, but would be up even more without dastardly warming?
As noted, an unprovable assertion

Or like the assertion that there is more food grown but it has 2% less nutrients.

Damning with faint praise

But, they admit agricultural output is up massively

Last edited 8 days ago by Pat from kerbob
Reply to  Pat from kerbob
April 2, 2021 9:04 pm

How can they ignore the real fact that hot house growers pump additional CO2 into their farms ?

Reply to  rwisrael
April 2, 2021 11:32 pm

By the same method they ignore any other part of reality that hasn’t gotten in synch with their models.

April 2, 2021 7:18 pm

I think he missed the point that we are in a CO2 famine.

April 2, 2021 7:31 pm

The chorus rises up singing the praises of CO2 induced planetary greening.

You’d think any deep thinking academic would be aware of the recent greening of our globe. You’d think any deep thinking academic would be aware that the early twentieth century global warming is indistinguishable from the late twentieth century (supposedly caused by CO2) warming.

But no. Once again we have academics who are blissfully unaware of facts that seem to be known by most of the rest of us.

Criticism of the Ivory Tower is as old as the hills. Apparently the Oxford English Dictionary defines it thus:

a state of privileged seclusion or separation from the facts and practicalities of the real world

That’s well and good except when the inhabitants of said Ivory Tower presume to speak about real world matters. You don’t need to be a master logician to see the problem there. However, with enough education, it’s a trifle that is easily ignored.

Tom in Toronto
April 2, 2021 7:42 pm

“economist” to ‘climate scientist’ it’s a seamless transition from one form of bullshit artist to another.

April 2, 2021 7:48 pm

This appears here at the same time as the notice of a reduction in the global average temperature, and within a couple days of the analysis showing 20 year temperature trend line for the U.S. is down. Even while CO2 continues to rise despite COVID lockdown. Crisis averted, just in time for Earth Day 2021.

Chris Hanley
April 2, 2021 7:53 pm

“… The climate crisis is already eating into the output of the world’s agricultural systems, with productivity much lower than it would have been if humans hadn’t rapidly heated the planet, new research has found …”.
Inversely it follows that a cooling climate with the same agricultural advances would rapidly increase current production inferring that the climate finally hit the ideal in 1950 when it is claimed all natural variation ceased.
The Earth has warmed overall about half a degree C in the past fifty or so years, well within historical precedents whatever the causes.
Alarmists cannot concede any benefits from a warming climate because they assume it is human-(white-male)-caused and therefore must be detrimental in every possible way.

Last edited 8 days ago by Chris Hanley
Rory Forbes
Reply to  Chris Hanley
April 2, 2021 8:38 pm

You virtually wrote almost exactly what I was just about to contribute. So I’ll simply add a plus and a “well said”. I could have spared the pain of reading beyond that. She had nothing to add.

Richard M
April 2, 2021 8:00 pm

NASA reports that not only is the world greening thanks to anthropogenic CO2, the extra vegetation is exerting a strong cooling effect on the surface of the planet

That has always been the missing link in climate studies. The enhanced growth fueled by CO2 enhances the biosphere. This requires energy. Much of the energy the climate cult claims will warm the planet goes into LIFE. Eventually, it is absorbed into the planet’s surface. Where to climate cultists think the energy found in fossil fuels originated?

Rory Forbes
Reply to  Richard M
April 2, 2021 8:40 pm

In other words, all’s right with the world and things proceed exactly as they’ve been doing for millions of years without our help or hindrance.

Reply to  Richard M
April 2, 2021 9:18 pm

This article states that Ottiz Bobea LED this study .
I think they got that wrong .He or she LIED this study as agricultural production has soared in the last 70 years as there were only 2.5 billion or so people in the world in 1950 .
The world population is now nudging 8 billion souls who all need food .
As some areas get a little warmer planting dates get earlier in the spring and crops are grown further north in Northern Hemisphere and further south in the Southern Hemisphere .
The Vikings farmed in Greenland towards the end of the MWP eight or nine hundred years ago but these researchers ignore facts like that and push nonsense.
It must be time to defund the Universities as they continue to push out drivel like this and call it research.
I have farmed all my life and our winters are a little milder than 40 years ago but I believe that climate is cyclic and is not controlled by a trace gas .
There are many factors at play and the climate can never reach a tipping point as it is self regulating and CO2 is saturated at 400 pp million and any further increase in temperature cannot occur .

Joel O'Bryan
April 2, 2021 8:40 pm

Just another GIGO model-based study.

Joel O'Bryan
April 2, 2021 8:44 pm

I wonder what these intellectual-idiots think global crop output would be if we didn’t use copious amounts of natural gas to make nitrogen fertilizers and pesticides, or petroleum and liquid petroleum condensates to make diesel and propane to run modern farming machinery?

Andre Den Tandt
April 2, 2021 9:10 pm

I would love to see how these people manage to separate the two opposite forces that end up causing a single effect, and give exact values to each. We can’t even measure these forces precisely by themselves.

Peta of Newark
April 2, 2021 10:23 pm

Its got the lot hasn’t it
Ivory towerisms, computer models, (misunderstood) Sputniks, I care more than you do isms and ###

Thus a tiny nugget of something that might contradict the Doom & Gloom narrative is perfectly misunderstood, slathered with anthropologicmorphism (what’s the word where plants are given human traits, is there one?) and used as a tool to beat everybody up

And Big Numberism so as to kick you while you’re down…
The figure of 3E21 Joules (see link below) over 15 years is, my calculation, 0.004% of the energy received from Sol in that time

Do we not ever, despite invitations to view/download/open-new-tab, get to see a genuinely Hi Res and up-to-date image of this Global Greening?
Not in my experience we don’t
What Are They Hiding

### I really do love this bit though. Such is the enthusiasm for negativity and self-promotion (done simultaneously is a Real Skill, gotta give ’em that)…
… we see this:
Quote:””a strong cooling effect on the land due to increased efficiency of heat and water vapor transfer to the atmosphere.””
From the big writing at the top of here

Ermmmm, isn’t that what CO2 does – increases the efficiency of heat transfer, from the surface soil/dirt and to the atmosphere?

Hasn’t NASA has just told us that atmospheric CO2 is a coolant?
Yes it is. A warmer atmosphere can ONLY mean a cooler ‘somewhere else’

And there are only 2 possible ‘somewhere elses’

  1. El Sol
  2. Earth Surface (Land and Water)

So which is it?
Coz heat energy in the atmosphere is spent energy – once there it cannot do any more work or heating, not least and especially from the place it came from.
Remember what Stefan said;
“”All objects lose energy dependant ONLY on their own absolute temperature and their own emissivity. It does not matter what other objects are near or far or what their temperatures are“”
If that doesn’t rule out Net Flow (a central plank of GHGE theory), wtf does?

What Has Gone Wrong With This World – why have the rats started eating each other with such manic enthusiasm & vigour?
Especially crazy in a story linked to ever increased greening, supposedly = Food Production.

[Mmmm, maybe Greenery is not = Food
For those still asleep, Covid is telling us that.
For The Comatose, so is an annual US medical health bill, just for obesity, of $173 Billion
Add to that personal annual costs of over $1300 for ‘regular’ fatness and $2500 for ‘gross’ fatness. Where does $1000+ per month for Insulin supplies fit in?]

Maybe that is what’s gone wrong………..

Reply to  Peta of Newark
April 3, 2021 9:16 am

“All objects lose energy dependant ONLY on their own absolute temperature and their own emissivity. It does not matter what other objects are near or far or what their temperatures are“

So, wearing a jacket doesn’t slow heat loss? The insulation in your attic doesn’t do anything? Blankets?

Another stupid comment, Peta.

Reply to  Meab
April 3, 2021 10:06 am

The jacket is not an atmosphere. The atmosphere is a fluid, your jacket is not. The atmosphere has convection, your jacket works by attempting to stop heat by convection. Not only radiation. Got it? It’s a huge difference and as such, you made the false analogy fallacy.

Reply to  Adrian
April 3, 2021 6:45 pm

Listen up. I just posted examples that show the quote does not address heat transport the way Peta thinks it does. I suspect that you are Peta because only a science-illiterate would respond the way you diid. A space blanket that has no insulating properties whatsoever works to warm a body by reflecting IR. The atmosphere slows the Earth’s cooling too. How do we know? What’s colder, the night side of the Earth after a few hours of darkness or the night side of the Moon? It’s the NET radiation that determines the cooling rate of a radiating body. Block the direct path of radiation to space with anything (anything warmer than the Cosmic Microwave Background) that can return a portion of the outgoing radiation and the cooling rate slows.

I know, I used to teach thermodynamics at a major university.

Teddy lee
April 3, 2021 12:29 am

Is it still April Fools Day?

Paul C
Reply to  Teddy lee
April 3, 2021 1:49 am

The publication date of the article is!

Rod Evans
April 3, 2021 12:40 am

I note from the abstract, they have developed a computer model to tell them the impact of warming/CO2 increase on plant growth.
At that point, I realised they were not doing scientific study they were engaged in computer games. That might explain their deep reluctance to go outside and actually take a long hard look at what is actually going on.
Perhaps someone should point out a simple but telling truth.
Warmth equals life while cold equals death.
Here in the UK a quarter way through the year we have had two days when the temperature reached 20 deg. C. Currently we are hoping today will give us a high of 10 deg. C with the coming week holding about the same.

April 3, 2021 12:50 am

Robust model…


Ed Zuiderwijk
April 3, 2021 1:11 am

CO2 harms plants. Only a true follower of the modern-day Lysenkos could say that.

Paul C
April 3, 2021 1:45 am

I think the publication date (01 April 2021) of that article is the only critical information it conveys. It has to be an April Fools joke.

Climate believer
April 3, 2021 1:47 am

Another “professeur” putting all his eggs in one climate catastrophe basket, creating his models (it’s all models) that confirm biased ideas and presenting that as a future reality to the rest of his lobotomised contemporaries.

He will be in his cosy retirement before any of his BS is exposed, but what does he care.

April 3, 2021 2:07 am

If CO2 harmed crop yields then farmers wouldn’t pump extra CO2 into their greenhouses.

April 3, 2021 5:02 am

Try growing any plant without CO2. That is the most absurd claim I’ve ever heard. That is like saying to lose weight you need to eat more ice cream.

Clearly, this economist never took Botany or Biology or attend a school worthy of the title higher education.

Ariel Ortiz-Bobea, an economist at Cornell University

Jim Gorman
April 3, 2021 5:23 am

Ariel has never stepped a foot on a farm. I just looked at the DeKalb site for corn seed varieties. For my zip code on the plains they list 203 different seeds with maturities between 76 to 120 days, and any number of traits on soil, water availability, prevalent diseases, crop types, etc.

He simply can’t know what he is talking about for at most 1 – 2 degrees of warming. In the US alone when you span from Texas to Canadian provinces you cover any climate change possibilities. If so called climate change was a problem, you would be seeing crop failures en mass somewhere in this range.

April 3, 2021 5:43 am

If not an april Fool, that so called study contradicts all known facts and newest research.

Bruce Cobb
April 3, 2021 6:03 am

In his curriculum vitae, he forgot to list the Production and Spreading of USDA Certified Grade A Prime fertilizer, of which this “research” is just one example.

April 3, 2021 6:20 am

Sadly the Earth’s gravitational attraction would have to increase for it to warm.

Ken Green
April 3, 2021 7:00 am

Speaking proudly before all like the emperor in his new clothes. Looking forward to another hot Summer of GW propaganda.

Dave Andrews
April 3, 2021 7:17 am

I’ve only read the Grauniads somewhat hyperbolic report by Oliver Milman with its ludicrous references to ” human induced heating” but it also says” with global population set to rise by more than 9 billion by 2050 the UN Food and Agriculture Organisation has estimated that food production will have to rise by 70% ”

As world population is already well over 7 billion I think someone can’t do the maths properly

Last edited 8 days ago by Dave Andrews
April 3, 2021 7:47 am

“A new study reports that increased vegetation growth during the recent decades, known as the “Greening Earth”, has a strong cooling effect on the land due to increased efficiency of heat and water vapor transfer to the atmosphere.”
Evidence for Urban heat island effect.

April 3, 2021 7:58 am

Bottom line is academics have learned monetary sources can be influenced by lies more efficiently and faster than the truth can be explained to a shallow mind.

Gordon A. Dressler
April 3, 2021 8:35 am

Regarding the above article and its credibility, all you need to know is contained in the first few words of article: “Ariel Ortiz-Bobea, an economist at Cornell University, claims . . .” (my bold emphasis added).

Reply to  Gordon A. Dressler
April 3, 2021 10:10 am

But they are all climate experts when they agree with the dogma of climastrology.

April 3, 2021 8:55 am

Eric wrote, “Warmer temperatures are no threat to agriculture. Even if Summer temperatures rise beyond the tolerance of some crops, the solution is plant a little earlier.”

Exactly right. To find a result in which warmer temperatures cause significant crop damage, you either have to use wildly unrealistic tests (like the Jasper Ridge wild grasses project), or else assume that farmers are too stupid to adjust their planting dates (like PNAS’s Zhao 2017 did). For example, a full 1°C of warming could be fully compensated for in the American grain belt by planting about six days earlier, as you can see:

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It is amazing the dreck that journals like Nature Climate Change publish these days, but at least they fittingly published this one on April Fools Day.

In the real world, rising CO2 levels have made crops both more productive and more drought-resistant. Those are two of the reasons that drought-triggered famines no longer periodically decimate large regions of the world:

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Elevated CO2 (eCO2) enables plants to use water more efficiently. It does so by increasing carbon uptake relative to transpiration. In other words, when grown with higher CO2 levels, plants need less water to get the carbon they need from CO2 in the atmosphere. That’s especially helpful in arid regions, and during droughts. Here’s a paper:

“There have been many studies on the interaction of CO2 and water on plant growth. Under elevated CO2, less water is used to produce each unit of dry matter by reducing stomatal conductance.”

That’s settled science. Yet, remarkably, most so-called “climate scientists” are ignorant of it.

Rising CO2 levels are extremely beneficial in places like India, which used to be plagued by famines, most of them triggered by drought. These photos were both taken in India, but more than a century apart:

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Look at those potatoes! The large benefits of eCO2 for potatoes and all other major crops has been known to science for more than a century. The benefits are so dramatic that in 1920(!) Scientific American called anthropogenic CO2 emissions “the precious air fertilizer.”:

The world is literally getting greener, largely thanks to anthropogenically elevated atmospheric CO2 levels. Here’s a map: image

Here’s a National Geographic article, about how even the “Sahara” desert (really the Sahel) is greening:

Images taken between 1982 and 2002 revealed extensive regreening throughout the Sahel, according to a new study in the journal Biogeosciences. … / The study suggests huge increases in vegetation in areas including central Chad and western Sudan. … “Before, there was not a single scorpion, not a single blade of grass,” he said. “Now you have people grazing their camels in areas which may not have been used for hundreds or even thousands of years. You see birds, ostriches, gazelles coming back, even sorts of amphibians coming back… The trend has continued for more than 20 years. It is indisputable.”

Here’s another article about it, in New Scientist:

The New Scientist article mentions dramatic improvements in yields of sorghum and millet, both of which are C4 crops. They are often grown in semi-arid regions, because of their low water requirements and high drought-resistance — which are greatly enhanced by eCO2, as this study reports:

Over 31,000 American scientists (including engineers in relevant disciplines) have signed a Petition affirming our conviction that:

There is substantial scientific evidence that increases in atmospheric carbon dioxide produce many beneficial effects upon the natural plant and animal environments of the Earth.

Chief among those “beneficial effects” is healthier, faster-growing plants, due to “CO2 fertilization.” A 2013 study found that in warm and arid environments over a 28 year period (1982-2010), as CO2 levels increased by 14%, foliage cover increased by 11%.

NASA measures the greening trend, from satellites:

Through all of human history until recently, famine was one of the great scourges of mankind. It was the Biblical “Third Horseman of the Apocalypse,” and the reason the Israelites fled their homeland for Egypt. But, thankfully, widespread famines are becoming a distant memory, and the rising atmospheric CO2 concentration is one of the major reasons for that blessing:
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Here’s a paper about how elevated eCO2 benefits wheat:

Perennial plants also benefit. Here’s what elevated CO2 levels do for pine trees:
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A 2011 University of Michigan study found that trees grow an average of 26% faster at 570 ppm, even with phenotypes optimized for current CO2 levels.

eCO2 is most beneficial for C3 crops, but here’s a paper about how eCO2 benefits corn, even though corn is a C4 crop:

eCO2 is especially beneficial for legumes, like beans, peas, and alfalfa, which are grown for their protein content. So eCO2 helps mitigate protein shortages in poor countries. Here’s a paper:

In fact, thousands of studies show that eCO2 is highly beneficial for ALL major crops. CO2 Science (a wonderful non-profit charity, very deserving of your support, BTW!) has a fantastic resource indexing for papers on the subject:

Scientific evidence is compelling that manmade climate change is modest & benign, and CO2 emissions are beneficial, not harmful. The major harms from CO2 are all hypothetical, and mostly implausible. The major benefits are measured, and very large.

Last edited 8 days ago by Dave Burton
April 3, 2021 11:25 am

Was this guy from the “real” Cornell University, or the one that Keith Olberman attended?

graham dunton
April 3, 2021 1:24 pm

What a load of rubbish, from Ariel Ortiz-Bobea, an economist at Cornell University,
Such a pity because Cornell University deserves better than that?
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Mike Maguire
April 3, 2021 3:25 pm

This is jaw dropping ignorance. The optimal level of CO2 for most plants and crops is around 900 PPM, more than double the current level………as shown by thousands of studies on plants.

If we were to send the atmosphere back into a time machine and have it return to pre industrial age levels, 1 billion people would starve to death within 3 years because of the plunge in crop yields/food production. Prices would more than triple as we rationed excessive demand for the insufficient supplies of most crops/food.

The greatest global warming is happening in the coldest places, especially during the coldest times of year. When the planet stops massively greening…………THEN, we will know that conditions have become unfavorable.
Authentic climate science, biology and agronomy tell us that we are a long way from that happening.

Reply to  Mike Maguire
April 3, 2021 4:43 pm

“If we were to send the atmosphere back into a time machine and have it return to pre industrial age levels, 1 billion people would starve to death within 3 years because of the plunge in crop yields/food production. Prices would more than triple as we rationed excessive demand for the insufficient supplies of most crops/food.”

Given other things these “climate scientists” say, I suspect that’s what they want.

April 3, 2021 4:18 pm

“Even if Summer temperatures rise beyond the tolerance of some crops, the solution is plant a little earlier.”

Shade cloth can help, too. Summers here often get too hot for tomatoes to produce, at least for a few weeks. A 40% shade cloth over them keeps them producing through the heat. Doesn’t seem to hurt anything else under it, either.

John Harrison
April 3, 2021 4:39 pm

I am concerned that there may be a serious error in this paper. The authors may have failed to take into account the radical increase in yields per hectare since the 1960s. To produce the total annual yield of the 1960s would require 70% less agricultural land today. Using the same area of land today would produce 3 times the total mass of crops produced in the 1960s. Yields per hectare have been spiralling upwards since then thanks largely to radical improvements in machinery, farming practices, fertilisers, pesticides, less frost damage due to moderately warmer nights along with extended growing seasons, enhanced fertilisation from slightly elevated atmospheric CO2 which also reduces irrigation demands. Hence the numbers suffering hunger and starvation have plummeted worldwide over recent decades. The findings of the authors seem to be completely at odds with the official data with respect to the continuing reduction in the area of agricultural land accompanied by a continuing rise in annual yields due to the widely recognised rise in yields per hectare. If my concerns are valid the authors may have caused unnecessary anxiety in the young and vulnerable which would be difficult to redress.

April 3, 2021 4:55 pm

I have a feeling his model is based on crop damage caused by every flood, drought, and forest fire, ascribing them all to manmade climate change, and comparing that to a world in which none of those events happened. Logically, if climate change is responsible for all those thing, then none of them could have happened prior to said climate change. Simply ignore the reality that they did.

First, and I’m sorry I didn’t do a screen save of this, there was once a UK science textbook online discussing the impact of CO2 on UK wheat (I think) crops. It said that on high-growing days, wheat stopped growing in the afternoon due to local CO2 levels dropping too low (imagine acres and acres of crops gulping all the CO2 they could get). I can no longer find it, but it certainly hit home why higher levels of CO2 increased crop yields.

Secondly, food production has been rising faster than population growth. We now produce enough food to feed the world. That some areas suffer famine is primarily due to civil wars, or tinpot dictators interfering with charitable food distribution, selling it on the black markets.

But the ultimate bottom line is: if we needed more food we would be growing more food. Anything now would be surplus, possibly going to waste.That’s why we can divert crops to fuel production, or build vast solar farms on arable land.

April 3, 2021 5:00 pm

Another April Fool joke.

From the research paper:

Extended Data Fig. 2 The response of agricultural productivity to weather without 10% of coldest countries.

Yup! They start with cherry picked data and it only gets worse.

 The coloured bands represent 90 and 95% confidence bands based on 500 year-by-region block bootstraps.”

Know a lot of tropical countries that have 500 years of harvest/temperature data? Data that the researchers can ‘average’?

The blue bars represent the country-level distribution of green-season average T over the sample period. The average green-season T is indicated for a select number of large countries.”

Average T? Over the sample period?
Again, cherry picking using faux data.

“The distribution represents the linear and quadratic T coefficients based on 10,000 reshuffled datasets. c, Same as previous panel but based on datasets reshuffled by country.”

Ten thousand reshuffled datasets? Now we’re playing the hide the pea shell game.

Extended Data Fig. 4 The response of agricultural productivity to weather for 1962–1988.

Cherry picking at it’s worst.
Worse, this is just a disguise for using far better reporting of storms, damages and crop losses as bait and switch proxy for diminishing crops.

I stopped reading at this point. Just another economist playing demigod pushing abused data while making claims opposite to observations.

Stan Bialecki
April 5, 2021 6:03 am

The current co2 concentration limits plant growth. Higher temperatures help plant growth. It’s almost as if they don’t know greenhouses work. How obtuse. FYI all. Plants evolved at 2500PPM Co2. In a greenhouse Co2 can make up for low light, poor temperature, drought, high humidity, and also limits plant disease. It’s literally the perfect tonic.

P.S. I;m a year round greenhouse grower.

April 5, 2021 11:33 am

I have sent my questions to Ariel, and don’t expect a response.
I have never received an answer to these questions from any Climate Scare Warrior: What should the earth’s perfect temperature be and has it ever been and for how long; and what should the correct level of CO2 be and do you believe like some that CO2 is a dangerous pollutant, and most important, if so who amongst us should be forced to hold our breath to stop CO2 from getting into the atmosphere???(considering that we inhale 400ppm and exhale approximately 20,000ppm)
Last but not least, is there a published or otherwise empirical paper or experiment linking CO2 to the Earth’s temperature? I think

April 10, 2021 5:52 pm

Someone needs to learn scientific notation.

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