HADCRUT Global Temperature Anomaly (part 2)

A quick squizz at the latest data with a side order of cogitation.

In the first part of this series we contemplated the fact that a wiggly line on a graph doesn’t do justice to the uncertainty surrounding data collection on a planet that is large in terms of the human scale. We noted the fact that the climatological normal of 1991-2020 had been abandoned in favour of retaining 1961-1990, presumably because the cooler ‘60s give rise to impressive anomalies that support the narrative. We ended up cogitating on two wrinkles, the first indicating that the greenhouse effect can seemingly run out of steam; the second indicating that the HADCRUT5 global temperature anomaly rises several months before atmospheric carbon dioxide rises. I also gently introduced folk to positive feedback in the carbon cycle, whereby a warmer planet will naturally produce more CO2 even without humans. This morning I’ll reveal two more wrinkles, starting with a slice of logic.

A Slice Of Logic

The greenhouse gas theory dictates that temperatures rise as a result of atmospheric carb…