Key Quote: “…the IPCC AR5 best estimate is that all of the warming since 1951 has been caused by humans.
So, what caused the early 20th century global warming? This issue has received remarkably little attention from climate scientists. Lack of an explanation for the early 20th century global warming diminishes the credibility of the attribution statement for warming since 1951.”
by Judith Curry
Part II: what causes variations and changes in hurricane activity?
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