Deliberately Alarmist ‘The Last Time CO2 Was This High’ Claims Are Rooted In Guesswork, Not Science

[rebewranger]

Deliberately Alarmist ‘The Last Time CO2 Was This High’ Claims Are Rooted In Guesswork, Not Science
By Kenneth Richard on 4. April 2022

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Recent reconstructions suggest CO2 concentrations may have ranged between 150 and 600 ppm (or more) throughout the last 4 million years.

We routinely see screaming headlines such as CO2 in the Atmosphere Climbs to Highest Level in 4.5 Million Years or Carbon Dioxide Levels Reach Highest Point in Human History.

However, these claims that modern CO2 levels are unusual or unprecedented are highly presumptive, resting on assumptions that we can accurately discern the atmospheric CO2 levels from alkenone, stomata, boron isotope…and other proxies.

It is presumed that air bubbles in Antarctic ice cores accurately record the “global” atmospheric CO2 levels for the last 400,000 years even though air bubbles from Greenland ice cores record entirely different CO2 values for the most recent millennia.

https://notrickszone.com/2022/04/04/deliberately-alarmist-the-last-time-co2-was-this-high-claims-are-rooted-in-guesswork-not-science/

[Kamaji]

There is no deterministic correlation between CO2 levels and temperature, not on the only meaningful scale - geologic time:

[Kamaji]

The one thing that chart definitely indicates is that, on geologic time scales, the temperature today is woefully below normal.

In other words, it should be getting warmer - a lot warmer!

Those who want to keep temperatures at the present icy levels need to explain why, not the other way around.