How well do we know atmospheric CO2 concentrations of the past?
Are ice cores the best representative measures of global CO2 concentration?
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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