My concern and research is summarized briefly:

Para 1: Warming in the Northern Hemisphere from 1918/19 till winter 1939/40 resulted from naval war in Northern Europe during WWI;

Para 2: with the onset of WWII a global cooling started due to naval war in the Europe’s waters, North Atlantic and since Dec.1941 in the Western Pacific, lasting until about mid-1970s.

Para 3: After the end of the Little Ice Age around 1850, a general warming was (logically) inevitable, with trend changes as mentioned in item 1&2, this may be still the main reason for warming since the LIA but not necessarily.

With regard to the question “a natural return to "normal", my answer is: The oceans (as the driver of weather and climate) work according physical laws, and in this respect the word “normal” does not fit well.

Maybe of interest?? MEDIUM Dec 28, 2020·5 min read. All the best!!

https://oceansgovernclimate.medium.com/tipping-point-oceans-defy-simple-physics-12b04a035680