IPCC Data: Rising CO2 is 75% Natural

A previous post reprinted later below raised the question Who to Blame for Rising CO?  It provided synopses of three studies challenging the IPCC orthodox explanation that humans are the cause by burning fossil fuels.  This post brings the research up to date with a 2021  publication by Edwin Berry.

The graph above summarizes Dr. Berry’s findings.  The lines represent CO2 added into the atmosphere since the 1750 level of 280 ppm.  Based on IPCC data regarding CO2 natural sources and sinks, the black dots show the CO2 data. The small blue dots show the sum of all human CO2 emissions since they became measurable, irrespective of transfers of that CO2 from the atmosphere to land or to ocean.

Notice the CO2 data is greater than the sum of all human CO2 until 1960. That means nature caused the CO2 level to increase prior to 1960, with no reason to stop adding CO2 since.  In fact, the analysis shows that in the year 2020, the human contribution to atmospheric CO2 level is 33 ppm, which means that from a 2020 total of 413 ppm, 280 is pre-industrial and 100 is added from land andl ocean during the industrial era.

A new carbon cycle model shows human emissions cause 25% and nature 75% of the CO2 increase is the title (and link) for Dr. Edwin Berry’s paper accepted in the journal Atmosphere August 12, 2021.  The pre-print version is available at Ed Berry’s website providing all the details and opportunity to ask questions.  Respecting his request not to post content from the paper, I provide some of his comments on threads at his blog in order to indicate the thrust of his analysis and findings.  Excerpts are in italics with my bolds.

Here is IPCC’s and climate alarmism’s core theory. It has 3 connected parts. Notice the separation of “natural carbon emissions” and “human carbon emissions”:

  • Natural carbon emissions remained constant after 1750.
  • These constant natural emissions support a CO2 level of 280 ppm.
  • Human carbon emissions caused all the CO2 increase above 280 ppm.
Data proves IPCC’s core theory is wrong.

In the figure above, the black dots show the CO2 data. The small blue dots show the sum of all human CO2 emissions. Notice the CO2 data is greater than the sum of all human CO2 until 1960. That means nature caused the CO2 level to increase. Therefore, IPCC’s core theory is wrong.

Don’t worry that the sum of human CO2 becomes greater after 1960 because the sum is not a valid argument anyway. It omits the flow of human CO2 out of the atmosphere.

The solid blue line shows the true effect of human CO2. In 2020, the human-caused increase in CO2 is 25 percent and the natural-caused increase in CO2 is 75 percent of the total increase.

The key point is the data have proven IPCC’s core theory is wrong.

The logic of my paper is simple. It has four steps:

1. It uses IPCC’s natural carbon cycle data.
2. It computes deductively the resulting true human carbon cycle.
3. This true human carbon cycle disagrees with IPCC’s human carbon cycle
4. Therefore, IPCC’s human carbon cycle is wrong.

IPCC’s human carbon cycle — the basis of all IPCC’s climate claims and climate models — contradicts IPCC’s natural carbon cycle data.  My proof of IPCC’s error is independent of outside data and is deductive. My model asserts two things about the CO2 cycle.

1. Human carbon derived from carbon fuels adds new carbon to the fast carbon cycle. (More precisely, it moves carbon from the slow carbon cycle to the fast carbon cycle.) My model keeps track of this added carbon. As of 2020, human carbon has added about one percent to the carbon in the fast carbon cycle.

2.Once this new carbon is added to the fast carbon cycle, it behaves physically and chemically exactly like all the other carbon in the fast carbon cycle.

The purpose of my model is to use IPCC’s black numbers for its natural carbon cycle to calculate the turnover times for the six nodes. Then, using these turnover times, my model calculates how human carbon, introduced annually into the atmosphere according to data, flows to the land, surface ocean, and deep ocean.

We don’t expect my calculations for human carbon to agree with IPCC’s numbers for its human carbon cycle because IPCC numbers assume the core theory is true, and my numbers assume IPCC’s natural carbon cycle is true.

My model does what the IPCC should have done but didn’t. My model calculates how the level changes with time using the same physics found in IPCC’s natural carbon cycle. These calculations show human carbon flows so fast from the atmosphere that only 33 ppm is still in the atmosphere in 2020.

This is the most accurate calculation anyone has made for the effect of human carbon on atmospheric CO2. Given this result, nature had to add 100 ppm to the atmosphere as of 2020.

Source :NOAA

Background from previous post Who to Blame for Rising CO2?

Blaming global warming on humans comes down to two assertions:

Rising CO2 in the atmosphere causes earth’s surface temperature to rise.

Humans burning fossil fuels cause rising atmospheric CO2.

For this post I will not address the first premise, instead refer the reader to a previous article referencing Fred Singer. He noted that greenhouse gas theory presumes surface warming arises because heat is forced to escape at a higher, colder altitude. In fact, temperatures in the tropopause do not change with altitude (“pause”), and in the stratosphere temperatures increase with altitude. That post also includes the “meat” of the brief submitted to Judge Alsup’s court by Happer, Koonin and Lindzen, which questions CO2 driving global warming in the face of other more powerful factors. See Courtroom Climate Science

The focus in this piece is the claim that fossil fuel emissions drive observed rising CO2 concentrations. IPCC consensus scientists and supporters note that human emissions are about twice the measured rise and presume that natural sinks absorb half, leaving the other half to accumulate in the atmosphere. Thus they conclude all of the increase in atmospheric CO2 is from fossil fuels.

This simple-minded conclusion takes the only two things we measure in the carbon cycle: CO2 in the atmosphere, and fossil fuel emissions. And then asserts that one causes the other. But several elephants are in the room, namely the several carbon reservoirs that dwarf human activity in their size and activity, and can not be measured because of their complexity.

The consensus notion is based on a familiar environmental paradigm: The Garden of Eden. This is the modern belief that nature, and indeed the climate is in balance, except for humans disrupting it by their activities. In the current carbon cycle context, it is the supposition that all natural sources and sinks are in balance, thus any additional CO2 is because of humans.

Now, a curious person might wonder: How is it that for decades as the rate of fossil fuel emissions increased, the absorption by natural sinks has also increased at exactly the same rate, so that 50% is always removed and 50% remains? It can only be that nature is also dynamic and its flows change over time!

That alternative paradigm is elaborated in several papers that are currently under vigorous attack from climatists. As one antagonist put it: Any paper concluding that humans don’t cause rising CO2 is obviously wrong. One objectionable study was published by Hermann Harde, another by Ole Humlum, and a third by Ed Berry is delayed in pre-publication review.

The methods and analyses are different, but the three skeptical papers argue that the levels and flows of various carbon reservoirs fluctuate over time with temperature itself as a causal variable. Some sinks are stimulated by higher temperatures to release more CO2 while others respond by capturing more CO2. And these reactions occur on a range of timescales. Once these dynamics are factored in, the human contribution to rising atmospheric CO2 is neglible, much to the ire of alarmists.

Ed Berry finds IPCC carbon cycle metrics illogical.

Dr. Ed Berry provides a preprint of his submitted paper at a blog post entitled Why human CO2 does not change climate. He welcomes comments and uses the discussion to revise and improve the text. Excerpts with my bolds.

The United Nations Intergovernmental Panel on Climate Change (IPCC) claims human emissions raised the carbon dioxide level from 280 ppm to 410 ppm, or 130 ppm. Physics proves this claim is impossible.

The IPCC agrees today’s annual human carbon dioxide emissions are 4.5 ppm per year and nature’s carbon dioxide emissions are 98 ppm per year. Yet, the IPCC claims human emissions have caused all the increase in carbon dioxide since 1750, which is 30 percent of today’s total.

How can human carbon dioxide, which is only 5 percent of natural carbon dioxide, add 30 percent to the level of atmospheric carbon dioxide? It can’t.


This paper derives a Model that shows how human and natural carbon dioxide emissions independently change the equilibrium level of atmospheric carbon dioxide. This Model should replace the IPCC’s invalid Bern model.

The Model shows the ratio of human to natural carbon dioxide in the atmosphere equals the ratio of their inflows, independent of residence time.


Fig. 5. The sum of nature’s inflow is 20 times larger than the sum of human emissions. Nature balances inflow with or without human emissions.

The model shows, contrary to IPCC claims, that human emissions do not continually add carbon dioxide to the atmosphere, but rather cause a flow of carbon dioxide through the atmosphere. The flow adds a constant equilibrium level, not a continuing increasing level, of carbon dioxide.


Fig. 2. Balance proceeds as follows: (1) Inflow sets the balance level. (2) Level sets the outflow. (3) Level moves toward balance level until outflow equals inflow.

Ole Humlum proves that CO2 follows temperature also for interannual/decadal periods.

Humlum et al. looks the modern record of fluctuating temperatures and atmospheric CO2 and concludes that CO2 changes follow temperature changes over these timescales. The paper is The phase relation between atmospheric carbon dioxide and global temperature OleHumlum, KjellStordahl, Jan-ErikSolheim.  Excerpts with my bolds.

From the Abstract:
Using data series on atmospheric carbon dioxide and global temperatures we investigate the phase relation (leads/lags) between these for the period January 1980 to December 2011. Ice cores show atmospheric CO2 variations to lag behind atmospheric temperature changes on a century to millennium scale, but modern temperature is expected to lag changes in atmospheric CO2, as the atmospheric temperature increase since about 1975 generally is assumed to be caused by the modern increase in CO2.

In our analysis we used eight well-known datasets. . . We find a high degree of co-variation between all data series except 7) and 8), but with changes in CO2 always lagging changes in temperature.

► Changes in global atmospheric CO2 are lagging 11–12 months behind changes in global sea surface temperature. ► Changes in global atmospheric CO2 are lagging 9.5–10 months behind changes in global air surface temperature. ► Changes in global atmospheric CO2 are lagging about 9 months behind changes in global lower troposphere temperature. ► Changes in ocean temperatures explain a substantial part of the observed changes in atmospheric CO2 since January 1980. ► Changes in atmospheric CO2 are not tracking changes in human emissions.


Summing up, monthly data since January 1980 on atmospheric CO2 and sea and air temperatures unambiguously demonstrate the overall global temperature change sequence of events to be 1) ocean surface, 2) surface air, 3) lower troposphere, and with changes in atmospheric CO2 always lagging behind changes in any of these different temperature records.9

A main control on atmospheric CO2 appears to be the ocean surface temperature, and it remains a possibility that a significant part of the overall increase of atmospheric CO2 since at least 1958 (start of Mauna Loa observations) simply reflects the gradual warming of the oceans, as a result of the prolonged period of high solar activity since 1920 (Solanki et al., 2004).

Based on the GISP2 ice core proxy record from Greenland it has previously been pointed out that the present period of warming since 1850 to a high degree may be explained by a natural c. 1100 yr periodic temperature variation (Humlum et al., 2011).

Hermann Harde sets realistic proportions for the carbon cycle.

Hermann Harde applies a comparable perspective to consider the carbon cycle dynamics. His paper is Scrutinizing the carbon cycle and CO2 residence time in the atmosphere. Excerpts with my bolds.

From the Abstract:

Climate scientists presume that the carbon cycle has come out of balance due to the increasing anthropogenic emissions from fossil fuel combustion and land use change. This is made responsible for the rapidly increasing atmospheric CO2 concentrations over recent years, and it is estimated that the removal of the additional emissions from the atmosphere will take a few hundred thousand years. Since this goes along with an increasing greenhouse effect and a further global warming, a better understanding of the carbon cycle is of great importance for all future climate change predictions. We have critically scrutinized this cycle and present an alternative concept, for which the uptake of CO2 by natural sinks scales proportional with the CO2 concentration. In addition, we consider temperature dependent natural emission and absorption rates, by which the paleoclimatic CO2 variations and the actual CO2 growth rate can well be explained. The anthropogenic contribution to the actual CO2 concentration is found to be 4.3%, its fraction to the CO2 increase over the Industrial Era is 15% and the average residence time 4 years.

Fig. 1. Simplified schematic of the global carbon cycle. Black numbers and arrows indicate reservoir mass in PgC and exchange fluxes in PgC/yr before the Industrial Era. Red arrows and numbers show annual  anthropogenic’ flux changes averaged over the 2000–2009 time period. Graphic from AR5-Chap.6-Fig.6.1. 


Climate scientists assume that a disturbed carbon cycle, which has come out of balance by the increasing anthropogenic emissions from fossil fuel combustion and land use change, is responsible for the rapidly increasing atmospheric CO2 concentrations over recent years. While over the whole Holocene up to the entrance of the Industrial Era (1750) natural emissions by heterotrophic processes and fire were supposed to be in equilibrium with the uptake by photosynthesis and the net ocean-atmosphere gas exchange, with the onset of the Industrial Era the IPCC estimates that about 15–40% of the additional emissions cannot further be absorbed by the natural sinks and are accumulating in the atmosphere. The IPCC further argues that CO2 emitted until 2100 will remain in the atmosphere longer than 1000 years, and in the same context it is even mentioned that the removal of human-emitted CO2 from the atmosphere by natural processes will take a few hundred thousand years (high confidence) (see AR5-Chap.6ExecutiveSummary). Since the rising CO2 concentrations go along with an increasing greenhouse effect and, thus, a further global warming, a better understanding of the carbon cycle is a necessary prerequisite for all future climate change predictions.

In their accounting schemes and models of the carbon cycle the IPCC uses many new and detailed data which are primarily focussing on fossil fuel emission, cement fabrication or net land use change (see AR5-WG1- Chap.6.3.2), but it largely neglects any changes of the natural emissions, which contribute to more than 95 % to the total emissions and by far cannot be assumed to be constant over longer periods (see, e.g.: variations over the last 800,000 years (Jouzel et al., 2007); the last glacial termination (Monnin et al., 2001); or the younger Holocene (Monnin et al., 2004; Wagner et al., 2004)).

Since our own estimates of the average CO2 residence time in the atmosphere differ by several orders of magnitude from the announced IPCC values, and on the other hand actual investigations of Humlum et al. (2013) or Salby (2013, 2016) show a strong relation between the natural CO2 emission rate and the surface temperature, this was motivation enough to scrutinize the IPCC accounting scheme in more detail and to contrast this to our own calculations.

Different to the IPCC we start with a rate equation for the emission and absorption processes, where the uptake is not assumed to be saturated but scales proportional with the actual CO2 concentration in the atmosphere (see also Essenhigh, 2009; Salby, 2016). This is justified by the observation of an exponential decay of 14C. A fractional saturation, as assumed by the IPCC, can directly be expressed by a larger residence time of CO2 in the atmosphere and makes a distinction between a turnover time and adjustment time needless.

Based on this approach and as solution of the rate equation we derive a concentration at steady state, which is only determined by the product of the total emission rate and the residence time. Under present conditions the natural emissions contribute 373 ppm and anthropogenic emissions 17 ppm to the total concentration of 390 ppm (2012). For the average residence time we only find 4 years.

The stronger increase of the concentration over the Industrial Era up to present times can be explained by introducing a temperature dependent natural emission rate as well as a temperature affected residence time. With this approach not only the exponential increase with the onset of the Industrial Era but also the concentrations at glacial and cooler interglacial times can well be reproduced in full agreement with all observations.

So, different to the IPCC’s interpretation the steep increase of the concentration since 1850 finds its natural explanation in the self accelerating processes on the one hand by stronger degassing of the oceans as well as a faster plant growth and decomposition, on the other hand by an increasing residence time at reduced solubility of CO2 in oceans. Together this results in a dominating temperature controlled natural gain, which contributes about 85% to the 110 ppm CO2 increase over the Industrial Era, whereas the actual anthropogenic emissions of 4.3% only donate 15%. These results indicate that almost all of the observed change of CO2 during the Industrial Era followed, not from anthropogenic emission, but from changes of natural emission. The results are consistent with the observed lag of CO2 changes behind temperature changes (Humlum et al., 2013; Salby, 2013), a signature of cause and effect. Our analysis of the carbon cycle, which exclusively uses data for the CO2 concentrations and fluxes as published in AR5, shows that also a completely different interpretation of these data is possible, this in complete conformity with all observations and natural causalities.


CO2 Fluxes, Sources and Sinks

Obsessed with Human CO2

Not Worried About CO2


  1. HiFast · November 6, 2021

    Reblogged this on Climate Collections.

    Liked by 1 person

  2. Pingback: Glasgow, COP-26 Elitists and Special Interests Promote China First, America Last, Why? Because Energy Savvy Engineers Were Not Successful In Educating The Public and Politicians on the True Facts | dickstormprobizblog's Blog
  3. dickstormprobizblog · November 7, 2021

    Reblogged this on dickstormprobizblog's Blog and commented:
    I have always believed Climate Change was mostly natural, here is a more scientific presentation showing 75% Natural forces are the cause of Climate Change. Thank you Ron Clutz for your analysis..

    Liked by 1 person

  4. Pingback: The Creed for Pawns – Climate- Science.press
  5. stpaulchuck · January 14, 2022

    % of atmospheric CO2 is moot. Read Nikolov and Zeller’s papers on the true cause of heating. As for who did what to whom, the papers I read some time back set human CO2 contribution at around 3.5% of annual total with some variance depending on rainfall/rotting vegetation and other parts of the Nature contribution.


  6. Ron Clutz · January 14, 2022

    Thanks for commenting spc. I have read N&Z’s papers, as well as Murry Salby’s textbook, and agree with you that supposed warming from CO2 is too small to make a difference. The point of this post is to get at a different issue: the amount of CO2 from humans compared to natural sources. Ed Berry demonstrates the logic failure in IPCC’s carbon modelling, which is useful to know given the propaganda about reducing carbon emissions. Your 3.5% is well taken


  7. Pingback: By the Numbers: CO2 Mostly Natural | Science Matters

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