Actually ...
Davis (2017) refutes the correlation ... the math gives a negative correlation between CO
2 and temperature ... please tell us where Davis makes his mistake ...
HAW HAW HAW HAW HAW HAW HAW HAW HAW HAW HAW HAW HAW HAW ...
you need to read your links before you post them ...
I agree that I should have read Davis' study before posting it as it certainly doesn't support my contention but I'm willing to let it stand as a bit of a testament to my open mindedness. ; - ) Neither you nor I are qualified to do a competent evaluation of his work, but as we both know, it stands in clear opposition to a great deal of published work by many authors - people who ARE qualified to evaluate his work. Such as:
whose abstract states:
The correspondence between atmospheric CO2 concentrations and globally averaged surface temperatures in the recent past suggests
that this coupling may be of great antiquity. Here, I compare 490 published proxy records of CO2 spanning the Ordovician to Neogene
with records of global cool events to evaluate the strength of CO2-temperature coupling over the Phanerozoic (last 542 my). For periods
with sufficient CO2 coverage, all cool events are associated with CO2 levels below 1000 ppm. A CO2 threshold of below 500 ppm is
suggested for the initiation of widespread, continental glaciations, although this threshold was likely higher during the Paleozoic due
to a lower solar luminosity at that time. Also, based on data from the Jurassic and Cretaceous, a CO2 threshold of below
1000 ppm is proposed for the initiation of cool non-glacial conditions. A pervasive, tight correlation between CO2 and temperature
is found both at coarse (10 my timescales) and fine resolutions up to the temporal limits of the data set (million-year timescales), indicating that CO2, operating in combination with many other factors such as solar luminosity and paleogeography, has imparted strong
control over global temperatures for much of the Phanerozoic.
And
whose abstract states:
Recent studies have purported to show a closer correspondence between reconstructed Phanerozoic records of cosmic ray flux and temperature than between CO2 and temperature. The role of the greenhouse gas CO2 in controlling global temperatures has therefore been questioned. Here we review the geologic records of CO2 and glaciations and find that CO2 was low (<500 ppm) during periods of long-lived and widespread continental glaciations and high (>1000 ppm) during other, warmer periods. The CO2 record is likely robust because independent proxy records are highly correlated with CO2 predictions from geochemical models. The Phanerozoic sea surface temperature record as inferred from shallow marine carbonate δ18O values has been used to quantitatively test the importance of potential climate forcings, but it fails several first-order tests relative to more well-established paleoclimatic indicators: both the early Paleozoic and Mesozoic are calculated to have been too cold for too long. We explore the possible influence of seawater pH on the δ18O record and find that a pH-corrected record matches the glacial record much better. Periodic fluctuations in the cosmic ray flux may be of some climatic significance, but are likely of secondorder importance on a multimillionyear timescale.
And
whose abstract states:
Over geological timescales, CO2 levels are determined by the operation of the long term carbon cycle, and it is generally thought that changes in atmospheric CO2 concentration have controlled variations in Earth's surface temperature over the Phanerozoic Eon. Here we compile independent estimates for global average surface temperature and atmospheric CO2 concentration, and compare these to the predictions of box models of the long term carbon cycle COPSE and GEOCARBSULF.
We find a strong relationship between CO2 forcing and temperature from the proxy data, for times where data is available, and we find that current published models reproduce many aspects of CO2 change, but compare poorly to temperature estimates. Models are then modified in line with recent advances in understanding the tectonic controls on carbon cycle source and sink processes, with these changes constrained by modelling 87Sr/86Sr ratios. We estimate CO2 degassing rates from the lengths of subduction zones and rifts, add differential effects of erosion rates on the weathering of silicates and carbonates, and revise the relationship between global average temperature changes and the temperature change in key weathering zones.
Under these modifications, models produce combined records of CO2 and temperature change that are reasonably in line with geological and geochemical proxies (e.g. central model predictions are within the proxy windows for >~75% of the time covered by data). However, whilst broad long-term changes are reconstructed, the models still do not adequately predict the timing of glacial periods. We show that the 87Sr/86Sr record is largely influenced by the weathering contributions of different lithologies, and is strongly controlled by erosion rates, rather than being a good indicator of overall silicate chemical weathering rates. We also confirm that a combination of increasing erosion rates and decreasing degassing rates over the Neogene can cause the observed cooling and Sr isotope changes without requiring an overall increase in silicate weathering rates.
On the question of a source or sink dominated carbon cycle, we find that neither alone can adequately reconstruct the combination of CO2, temperature and strontium isotope dynamics over Phanerozoic time, necessitating a combination of changes to sources and sinks. Further progress in this field relies on >108 year dynamic spatial reconstructions of ancient tectonics, paleogeography and hydrology. Whilst this is a significant challenge, the latest reconstruction techniques, proxy records and modelling advances make this an achievable target.
The abstract includes this graphic:
So, somebody has made a mistake and given the numbers of scientists that say the two parameters are correlated through the entire Phanerozoic and the undeniable correlation already established for the last 60 million years (and the absolute nutcase "study" that Davis Jr and Sr put out blaming all the Earth's ills and the collapse of civilization on changes in the Arctic winds (see:
Antarctic Winds: Pacemaker of Global Warming, Global Cooling, and the Collapse of Civilizations)), the odds point heavily towards Davis as the errant body.
