They tend to have a reputation for being regional, but during
the mid-century slight cooling, the Northern Hemisphere as a whole seemed to be effected.
-- There is a GH theory, but NO EMPIRICAL EVIDENCE that links the two (in fact, the 30 - year
mid-century cooling cycle as well as the
slight cooling of the past 15 years despite ever increasing CO2 levels tend to FALSIFY the CAGW premise).