by Lain Aitken, May 14, 2017
Is carbon dioxide our friend or our foe? Guest essay by Iain Aitken. Here is a dossier of key facts about carbon dioxide …
Archives par mot-clé : CO2
Is Murry Salby Right?
by Red Istvan, May 13,2017
The core of Salby’s theory is derived using CO2 data from MLO’s Keeling Curve since 1958, and satellite temperature data since 1979. (His few charts reaching back to 1880 contain acknowledged large uncertainties.) His theory builds off a simple observation, that in ‘official’ estimates of Earth’s carbon cycle budget, anthropogenic CO2 is only a small source compared to large natural sources and sinks.
Recent pause in the growth rate of atmospheric CO2 due to enhanced terrestrial carbon uptake
by Keenan et al., November 8, 2016, Nature
Terrestrial ecosystems play a significant role in the global carbon cycle and offset a large fraction of anthropogenic CO2 emissions. The terrestrial carbon sink is increasing, yet the mechanisms responsible for its enhancement, and implications for the growth rate of atmospheric CO2, remain unclear.
web- Comments
Jim McIntosh , David Mulberry and 2 others posted in Air-Climate-Energy (Jim McIntosh 9 May at 11:18): Reposting because those AGW alarmists hate this report. Yes, plants are doing it better than any carbon tax and they do it for free… as long as we don’t cut them down. You’d think we’d learn by now that managing climate comes back to how we have mismanaged the planet’s forests.
EU trend of CO2 reduction seems to have stopped
by Peter Teffer, May 4, 2017 in euobserver
The EU’s statistical agency Eurostat announced Thursday (4 May) that CO2 emissions resulting from the EU’s energy use have “slightly decreased” in 2016, compared to the year before.
But Eurostat’s press release did not mention that the small decrease has not made up for the small increase in CO2 emissions the year before, and that more CO2 was emitted in 2016 than in 2014.
Y=mX+b, how does Constant CO2 Cause a Change in Temperature?
by co2is life blog, April 15, 2017
The theory goes that over time CO2 increases resulting in an increase in temperature, put another way, temperature is a function of CO2, or T=f(CO2). This model, however, is deeply flawed and demonstrates a disturbing ignorance of science, modeling, and the physics behind the greenhouse gas effect.
Pause Or Not, Climate Models Continue To Grossly Overstate Global Temperature Trends
by P. Gosselin, April 8, 2017
Looking at data objectively, it is pretty clear that there is little relationship between weather/climate and the rising CO2 concentrations in the atmosphere, as the global warming pause between 1997-2016 shows –
Captage du CO2 : Total investit à nouveau en Norvège
by Connaissances des Energies, 11 Avril 2017
Le groupe français Total a signé le 7 avril un protocole de partenariat avec le Technology Centre de Mongstad (TCM), l’une des plus grandes installations au monde de tests en matière de captage de CO2.
Recent increase in oceanic carbon uptake driven by weaker upper-ocean overturning
by Tim De Vries et al., Nature Feb 9, 2017
Continued weakening of the upper-ocean overturning is likely to strengthen the CO2 sink in the near future by trapping natural CO2 in the deep ocean, but ultimately may limit oceanic uptake of anthropogenic CO2.
Questions on the rate of global carbon dioxide increase
by Robert Balic, April 7, 2017
Its also a stretch to assume perfect correlation of the real values, especially since its claimed that CO2 levels have increased due to human emissions and the latter have been at a steady rate for the last three years. There is also the question of why such a good correlation with SH sea-surface temperatures and not NH, and why should the correlation be so perfect when things like changes in ocean currents should have a large effect on how much is sequestered into the depths of the oceans.
Claim: Earth’s Greatest Mass Extinction is a Warning to Us
by Eric Worrall, March 27, 2017
A paper published in Paleoworld worries that a repeat of the greatest mass extinction event in Earth’s history could be triggered by Anthropogenic CO2. But Cambridge Professor Peter Wadhams, our favourite sea ice alarmist, thinks the attempt to link the Permian extinction to modern events is a bit wild.
Effect of Atmospheric CO2 Concentrations on Early Human Societies
by Don Healy, March24, 2017
During the past 100,000 years, human societies have witnessed the vast change in climate that has occurred as we have transitioned from a glacial period that ended about 20,000 years ago, into the current interglacial period.
The Logarithmic Effect of Carbon Dioxide
by David Archibald, March 8, 2010
The greenhouse gasses keep the Earth 30° C warmer than it would otherwise be without them in the atmosphere, so instead of the average surface temperature being -15° C, it is 15° C. Carbon dioxide contributes 10% of the effect so that is 3° C. The pre-industrial level of carbon dioxide in the atmosphere was 280 ppm. So roughly, if the heating effect was a linear relationship, each 100 ppm contributes 1° C. With the atmospheric concentration rising by 2 ppm annually, it would go up by 100 ppm every 50 years and we would all fry as per the IPCC predictions.
But the relationship isn’t linear, it is logarithmic. In 2006, Willis Eschenbach posted this graph on Climate Audit showing the logarithmic heating effect of carbon dioxide relative to atmospheric concentration
IEA finds CO2 emissions flat for third straight year even as global economy grew in 2016
International Energy Agency, March 17, 2017
The biggest drop came from the United States, where carbon dioxide emissions fell 3%, or 160 million tonnes, while the economy grew by 1.6%. The decline was driven by a surge in shale gas supplies and more attractive renewable power that displaced coal. Emissions in the United States last year were at their lowest level since 1992, a period during which the economy grew by 80%.
Scrutinizing the carbon cycle and CO2 residence time in the atmosphere
by Hermann Harde, Global and Planetary Change, 24 February 2017
Highlights
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An alternative carbon cycle is presented in agreement with the carbon 14 decay.
The CO2 uptake rate scales proportional to the CO2 concentration.
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Temperature dependent natural emission and absorption rates are considered.
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The average residence time of CO2 in the atmosphere is found to be 4 years.
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Paleoclimatic CO2 variations and the actual CO2 growth rate are well-reproduced.
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The anthropogenic fraction of CO2 in the atmosphere is only 4.3%.
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Human emissions only contribute 15% to the CO2 increase over the Industrial Era.
Climate Science : some principles
Dr. Albert Jacobs, Calgary, Canada
Climate science seems to have been taken over by politicians and the media. It is therefore essential to keep the debate alive on scientific principles, rather than popular hype.
This complex amalgam of scientific disciplines, called Climate Science, is replete with uncertainties and controversies. Politicians will proclaim that “The Science is settled”, because politicians do not want to deal with uncertainties. As scientists, we know that science is never “settled”. Scientific progress thrives on challenges and debate and it is up to science organisations to foster that.
Le changement climatique : la règle en géologie … Le taux de CO2 atmosphérique n’a jamais été aussi faible qu’aujourd’hui et la relation température/teneur en CO2 reste encore mal comprise
par Alain Préat
Article publié ( 27 décembre 2016) sur http://revue-arguments.com
Egalement pour les commentaires, sur le site notre-planete.info
Un écheveau d’une incroyable complexité
Depuis que la Terre existe, c’est-à-dire depuis 4,567 milliards d’années [1], s’il est bien une constante c’est qu’elle n’est jamais restée figée telle quelle, et qu’elle fut sans cesse profondément modifiée de façon plutôt aléatoire. Cela concerne autant les processus internes (notamment la composition de la lithosphère et les variations des mécanismes affectant la dérive des continents) que les processus externes. Parmi ces derniers l’atmosphère n’a cessé de varier du tout au tout notamment en ce qui concerne sa composition gazeuse. L’ensemble de ces processus internes et externes se sont sans cesse ‘télescopés’ et ont entraîné des rétroactions complexes à l’origine des nombreux changements climatiques observés dans les archives géologiques. A ces paramètres s’ajoutent également ceux pilotés à l’échelle extraterrestre, parmi les plus importants citons l’activité du Soleil ou les variations des paramètres orbitaux de notre Planète (précession, obliquité, écliptique). Le résultat est une combinaison extrêmement complexe de processus cumulatifs réguliers, irréguliers, linéaires ou non, chaotiques souvent, jouant à toutes les échelles temporelles et affectant à tout moment le climat qui en constitue une réponse. Physiciens, chimistes, biologistes, géographes… géologues tentent chacun à partir de son pré-carré de démêler cet écheveau particulièrement difficile à comprendre. Les synergies entre les disciplines sont heureusement nombreuses et le système climatique est peu à peu mis à nu à travers les temps géologiques (voir figure ci-dessous pour la succession des âges géologiques).
Echelle des temps géologiques:
Climate Change : the Rule in the Geological Record (Conference)
par Alain Préat
The first aim of paleoclimate science is to identify from observations of the geological record, the nature of past climate changes. Paleoclimate is probably the oldest discipline in Earth science, it began in the 19th-century, and earlier with the discovery of elephant-like beast in the superficial deposits of Europe and Siberia debate about the intepretation in the 18th-century. The debate was about these surface enviroments of temperate areas shaped by the biblic flood or by glaciers [Préat, 2015 http://www.notre-planete.info/actualites/actu_4356.php]. By the middle of the 20th-century, many climate features associated with the recent ice ages have been identified. Geological processes are critical to the evolution of the climate. The most important issue pertaining the earliest evolution of the Earth’s climate is that energy emitted by the sun has progressively increased over 4.6Ga. Recontructing climate history from the inherently incomplete geological record requires integrated analyses including geochronology, paleomagnetostratigraphy, paleobiology, paleotectonics etc. Climate change in the geological past is the rule, it has been reconstructed using a number of key archives (including sedimentary, geochemical proxies) since billion of years. These records reveal that since its birth the Earth’s climate as a rule has been warming up or cooling down with periods of (super)greenhouse and (super)icehouse modes, on scales of thousands to hundreds of million of years. The controlling factors are both cyclic (external or astronomical) and secular (internal to the Earth) and related to plate tectonics. For more than 90 percent of its 4.6 billion-year history, Earth has been too warm, even at the poles, for ice sheets to form. We live in unusual times at least from the cooling at the Eocene-Oligocene boundary (± 34 Ma) with the glaciating Antarctica. The Earth was also severely glaciated several times in its history (e.g. about 750 and 535 Ma). As an example of the conditions prevailing in the very warm times, oxygen isotopes suggest that the Archean seawater (4.0-2.5 Ga) coud have experimented hyperthermal environments, with temperatures as high as 55-85°C [Knauth, 2005 Palaeogeography, Palaeoclimatology, Palaeoecology, 219 : 53-69]. Considering the Precambrian as a whole (4.6-0.541 Ga), prior to about 2.2 billion years ago, the amount of oxygen in the atmosphere and surface ocean was small, concentrations of CO2 were as high as 100-1000 times modern levels, as those of CH4 which were more higher. Complex microbial eocosystems developed during this period (sulfate-reducing bacteria, autotrophic methanogens, fermenting bacteria, anoxygenic phototrophic bacteria) and could have been important contributors to the biological productivity of early Earth. Past about 2.2 Ga the productivity began to be driven by oxygen-producing (micro)organisms.