Within the last few years, over 30 papers have been added to our compilation of scientific papers that find the climate’s sensitivity to CO2 concentration changes is low to negligible.
A few of the papers published in 2018 that were added to the list are provided below.
“The results of this review point to the extreme value of CO2 to all life forms, but no role of CO2 in any significant change of the Earth’s climate. … Many believe and/or support the notion that the Earth’s atmosphere is a ‘greenhouse’ with CO2 as the primary “greenhouse” gas warming Earth. That this concept seems acceptable is understandable—the modern heating of the Earth’s atmosphere began at the end of the Little Ice Age in 1850. The industrial revolution took hold about the same time. It would be natural to believe that these two events could be the reason for the rise in temperature. There is now a much clearer picture of an alternative reason for why the Earth’s surface temperature has risen since 1850.”
“There is no correlation of CO2 with temperature in any historical data set that was reviewed. The climate-change cooling over the 1940–1975 time period of the Modern Warming period was shown to be influenced by a combination of solar factors. The cause of the Medieval Warm Period and the Little Ice Age climate changes was the solar magnetic field and cosmic ray connection. When the solar magnetic field is strong, it acts as a barrier to cosmic rays entering the Earth’s atmosphere, clouds decrease and the Earth warms. Conversely when the solar magnetic field is weak, there is no barrier to cosmic rays—they greatly increase large areas of low-level clouds, increasing the Earth’s albedo and the planet cools. The factors that affect these climate changes were reviewed in “Solar magnetic field/cosmic ray factors affecting climate change” section. The calculations of “H2O and CO2 in the radiation package” section revealed that there is no net impact of CO2 on the net heating of the atmosphere. The received heat is simply redistributed within the atmospheric column. This result is consistent and explains the lack of CO2 correlations with observations in the past. The current Modern Warming will continue until the solar magnetic field decreases in strength. If one adds the 350-year cycle from the McCracken result to the center of the Maunder Minimum which was centered in 1680, one would have a Grand Minimum centered in the year 2030.”
“From this, it follows for the change of the global temperature as a result at doubling of the concentration of atmospheric CO2 molecules [is] ∆T = (0.4 ± 0.1) K, where the error accounts for the accuracy of used values, whereas the result depends on processes included in the above scheme. Indeed, we assume the atmospheric and Earth’s albedo, as well as another interaction of solar radiation with the atmosphere and Earth, to be unvaried in the course of the change of the concentration of CO2 molecules, and also the content of atmospheric water is conserved. Because anthropogenic fluxes of carbon dioxide in the atmosphere resulted from combustion of fossil fuels is about 5% [Kaufman, 2007], the contribution of the human activity to ECS (the temperature change as a result of doubling of the atmospheric carbon dioxide amount) is ∆T = 0.02 K, i.e. injections of carbon dioxide in the atmosphere as a result of combustion of fossil fuels is not important for the greenhouse effect.”
“[T]he contemporary global warming increase of ~0.8 °C recorded since 1850 has been attributed widely to anthropogenic emissions of carbon dioxide (CO2) into the atmosphere. Recent research has shown, however, that the concentration of CO2 in the atmosphere has been decoupled from global temperature for the last 425 million years [Davis, 2017] owing to well-established diminishing returns in marginal radiative forcing (ΔRF) as atmospheric CO2 concentration increases. Marginal forcing of temperature from increasing CO2 emissions declined by half from 1850 to 1980, and by nearly two-thirds from 1850 to 1999 [Davis, 2017]. Changes in atmospheric CO2 therefore affect global temperature weakly at most.”
“Calculate for a doubling of CO2 from the pre-industrial level of 0.03% [300 ppm]: [formula found in text] Calculated temperature after doubling of CO2 to 0.06% [600 ppm] ≈ 288.11 K. Climate sensitivity to CO2 is ≈ 288.14 – 288.11 ≈ – 0.03 K.”
“The change would in fact be extremely small and difficult to estimate exactly, but would be of the order -0.03°C. That is, a hundred times smaller than the ‘likely’ climate sensitivity of 3°C cited in the IPCC’s reports, and also probably of the opposite sign [cooling]. Even that small number would likely be a maximum change, since if fossil fuels are burned to create the emitted CO2, then atmospheric O2 will also be consumed, reducing that gas in the atmosphere – and offsetting any temperature change generated by the extra CO2. This climate sensitivity is already so low that it would be impossible to detect or measure in the real atmosphere, even before any allowance is made for the consumption of atmospheric O2.”
“Knowledge about thermal radiation of the atmosphere is rich in hypotheses and theories but poor in empiric evidence. Thereby, the Stefan-Boltzmann relation is of central importance in atmosphere physics, and holds the status of a natural law. However, its empirical foundation is little, tracing back to experiments made by Dulong and Petit two hundred years ago. … For studying the pressure dependency, the experiments were carried out at locations with different altitudes. For the so-called atmospheric emission constant A an approximate value of 22 Wm−2 bar−1 K−0.5 was found. In the non-steady-state, the total thermal emission power of the soil is given by the difference between its blackbody radiation and the counter-radiation of the atmosphere. This relation explains to a considerable part the fact that on mountains the atmospheric temperature is lower than on lowlands, in spite of the enhanced sunlight intensity. Thereto, the so-called greenhouse gases such as carbon-dioxide do not have any influence.”
“While a theoretical calculation of such an absorption coefficient was not feasible, at least a principal explanation may be given: There is no good reason to assume that absorbed IR-radiation will be entirely transformed into heat. Instead, it is conceivable that a part of it is re-emitted, i.e. to say in all directions, before having induced a temperature enhancement.”
“This approach contradicts in many ways the conventional greenhouse theory: Firstly, the boundary processes at the Earth surface and at the lowest layer of the atmosphere are predominant, while the conventional greenhouse theory regards the whole atmosphere; and secondly—even more crucial—the radiation budget is solely determined by the air conditions of the atmosphere such as pressure and temperature while so-called ‘greenhouse gases’ such as carbon-dioxide do not have the slightest influence on the climate. Besides, the atmosphere cannot really be compared to a greenhouse, not least due to the absence of a glass-roof which absorbs IR-radiation, and which inhibits considerable air convection.”
“Using a simple 1-dimensional model the global warming of the surface is computed that is generated by the increase of GHG and the albedo change. A modest effect by the GHG of 0.08 K is calculated for the period 1880 to 1955 with a further increase by 0.18 K for 1955 to 2015. A larger contribution of 0.55 ± 0.05 K is estimated for the melting of polar sea ice (MSI) in the latter period, i.e. it notably exceeds that of the GHG and may be compared with the observed global temperature rise of 1.0 ± 0.1 K during the past 60 years.”
“In conclusion we wish to say that we have performed a study of the infrared properties of carbon dioxide, methane, dinitrogen-oxide and water to estimate their contribution to the global warming in 1880 – 2015. Our results suggest that the IR properties of the CO2 are responsible for ~ 20% of the mean temperature increase of the surface [during 1880-2015] and notably less for CH4 and N2O.”