How well do we know atmospheric CO2 concentrations of the past?

Are ice cores the best representative measures of global CO2 concentration?

Mar 15, 2023

∙ Paid

The essential crux of the anthropogenic global warming theory is that for the past 800k years, global atmospheric CO2 concentrations only fluctuated between 180-300ppm and thus the increase to the current levels of 420ppm is from anthropogenic emissions.

But, how good are ice cores at recording short-term fluctuations in atmospheric CO2 concentration? In…

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