Category Archives: Carbon Dioxide

Domestic livestock have no significant effect on atmospheric methane

“The main source of atmospheric methane since 1995 is from natural sources with great variability. It is not from domestic livestock as noted by Albrecht Glatzle[6]. However it is possible fracking and increased transport of natural gas may make a contribution to the methane in the atmosphere.” click here

Carbon dioxide is not a pollutant and is not toxic

“The results from a 2018 study (Rodeheffer et al., 2018) measuring the cognitive and decision-making performances of submariners exposed to elevated CO2 undermined the attempts to portray CO2 as a brain-function-impairing toxin. In the study, subjects were exposed to 3 CO2 conditions: 600, 2500, and 15000 ppm. The results indicated there were “no significant differences” in how the subjects performed for any of the CO2 exposure levels.” click here

Atmospheric temperature dominantly controls atmospheric carbon dioxide

Hermann Harde. What Humans Contribute to Atmospheric CO2: Comparison of Carbon Cycle Models with Observations. Earth Sciences, Volume 8, Issue 3, June 2019, Pages: 139-159. doi: 10.11648/j.earth.20190803.13

The Intergovernmental Panel on Climate Change assumes that the inclining atmospheric CO2 concentration over recent years was almost exclusively determined by anthropogenic emissions, and this increase is made responsible for the rising temperature over the Industrial Era. Due to the far reaching consequences of this assertion, in this contribution we critically scrutinize different carbon cycle models and compare them with observations. We further contrast them with an alternative concept, which also includes temperature dependent natural emission and absorption with an uptake rate scaling proportional with the CO2 concentration. We show that this approach is in agreement with all observations, and under this premise not really human activities are responsible for the observed CO2 increase and the expected temperature rise in the atmosphere, but just opposite the temperature itself dominantly controls the CO2 increase. Therefore, not CO2 but primarily native impacts are responsible for any observed climate changes.

Carbon dioxide a small contributor to downwelling long wave radiation

D. R. Feldman, W. D. Collins, P. J. Gero, M. S. Torn, E. J. Mlawer, T. R. Shippert. Observational determination of surface radiative forcing by CO2 from 2000 to 2010. Nature volume 519, pages 339–343 (19 March 2015)

The climatic impact of CO2 and other greenhouse gases is usually quantified in terms of radiative forcing1, calculated as the difference between estimates of the Earth’s radiation field from pre-industrial and present-day concentrations of these gases. Radiative transfer models calculate that the increase in CO2 since 1750 corresponds to a global annual-mean radiative forcing at the tropopause of 1.82 ± 0.19 W m−2 (ref. 2). However, despite widespread scientific discussion and modelling of the climate impacts of well-mixed greenhouse gases, there is little direct observational evidence of the radiative impact of increasing atmospheric CO2. Here we present observationally based evidence of clear-sky CO2 surface radiative forcing that is directly attributable to the increase, between 2000 and 2010, of 22 parts per million atmospheric CO2. The time series of this forcing at the two locations—the Southern Great Plains and the North Slope of Alaska—are derived from Atmospheric Emitted Radiance Interferometer spectra3 together with ancillary measurements and thoroughly corroborated radiative transfer calculations4. The time series both show statistically significant trends of 0.2 W m−2 per decade (with respective uncertainties of ±0.06 W m−2 per decade and ±0.07 W m−2 per decade) and have seasonal ranges of 0.1–0.2 W m−2. This is approximately ten per cent of the trend in downwelling longwave radiation5,6,7. These results confirm theoretical predictions of the atmospheric greenhouse effect due to anthropogenic emissions, and provide empirical evidence of how rising CO2 levels, mediated by temporal variations due to photosynthesis and respiration, are affecting the surface energy balance.

No correlation between CO2 and earth’s temperature

I find reconstructions of past global temperatures and carbon dioxide levels such as here to be very interesting from an academic perspective. But attempts to reconstruct temperatures of the geologic past are fraught with assumptions and interpretations of the geologic record driven by presuppositions. The weight of scientific evidence across scientific disciplines does not support dating the age-of-the-earth at billions of years.

However, I do agree with the major point being made here regarding CO2 and temperature. If you believe the past geological timescale temperature reconstruction posted here, and believe that CO2 is somehow mechanistically driving global temperatures, then you clearly have a problem because this particular geologic timescale reconstruction does not support such a position. In any case, since no one was preset in the past to measure actual temperatures and CO2 levels their past levels and correlation (or lack of correlation) is speculative.

Past heat waves in France and Europe are real

International climate commitments promise progress when there is none.

“Having been relatively stable overall for the last 7 years, global CO2 emissions grew by ~2.0% in 2018.  2.5% of this growth was in the Developing world whereas 1.1% of the growth was in the Developed world.  This growth of ~650,000,000 tonnes in 2018 was despite all the international “commitments” arising from the Paris Climate Agreement.” click here