The data in this paper shows
a) in about 1970, there was a significant increase in the slope of increase of temperature from the previous 100 years;
b) that there has not been an increase in that slope in the past 10-15 years (hence the term surge);
c) that surge (slope) increase would have to be on order of 75% in the past 15 years to be detectable.
This article does not refute the impact of humans on global warming.
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“There is no such thing as a normal period of history. Normality is a fiction of economic textbooks.”
— Joan Robinson, “Contributions to Modern Economics” (1978)
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