One of the few benefits of increasing age is having read stuff written in the 20th Century.
Once upon a time I had a precious book, "The Sea Around Us" written in the late 1940's by Rachel Carson (yes - the author of "Silent Spring") and published in 1951. It was 86 weeks in the best seller list of the New York Times. I foolishly lent it to a "friend".
A stray memory took me to the library, and to my amazement they were able to find me a copy to borrow, and my memory was right. There is a chapter on Arctic Sea Ice and the changing to a warmer climate since about 1900. The basics are all there, retreating sea ice, melting Norwegian glaciers, fish and birds moving north, longer growing seasons and new sea routes open. The basic science is there concerning a layer of cold freshwater overlying warmer, saltier water. Which brings me to submarine waves and Otto Petersson, who published in 1912 a paper "Climatic variations in historic and prehistoric time".
His contention was that the strength of submarine waves depends on the gravitational force exerted by the sun, moon and planets which in turn depend on orbital variations, and that these submarine waves have a far greater amplitude than surface tides. He calculated the most recent major period of maximum tidal action as in AD 1433, the most recent minimum at AD 450 , and the next minimum at AD 2400.. He also calculated minor cycles every 9, 18 and 36 years.
This variation in tidal action was sufficient to force the major changes in the Atlantic and Arctic Oceans and from that the European climate.
Is it not possible that this science is still valid as a force that can enhance or reduce the effects of AGW? That mixing between that cold freshwater surface layer and deeper warmer, saltier water can be increased during periods of higher tidal action and reduced during periods of lower tidal action? And that in turn depends on variations in the orbits of the planets that are easily calculated using the mathematics of Newton?
Here is the link to Petersson's paper. Fascinating stuff, and think on the years it took to get all the data together.
http://www.mitosyfraudes.org/calen12/petterson_1.html