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It is interesting - whats the validity of the historic data? Theres clearly some consistent patterns if that data is to be trusted.

Though scientific, it's still a guesstimate and not factual data.

> Changes in past atmospheric methane concentrations are determined by measuring the composition of air trapped in ice cores from Antarctica.

measurement, not "guesstimate"

Right, like every measurement humanity has ever made.

The historical data is based on an analysis of air bubbles trapped in Antarctic ice cores.