Global Cooling 1940–1975
would change the game

Dr. Arnd Bernaerts
4 min readMar 28, 2021


“If science can’t explain climate shifts pre 1950, how can we trust today’s climate models?” lamented Prof. Judith Curry back in 2014. . There had been actually two since the end of the Little Ice Age (~1850), the warming from 1918–1939, and the even more significant global cooling period from winter 1939/40 to mid-1970s, which is the only topic of this essay. All climate models fail because both were man-made by naval war during the two World Wars almost a century ago. If science would be able and willing to explain one of the shifts, the narrative of global warming by carbon dioxide (CO2) would dramatically change.

Although the Second World War ended 76 years ago science knows nothing about what the war did to climate. This is inexcusable because the meteorological observations and data collection were very high. In addition, the climate in Europe literally collapsed in the first winter of the war in 1939/40. Several regions in Central Europe up to the Ural measured their ever coldest temperatures recorded, or their coldest winter since the early 19th Century, around 1820 which had been called the “Cold Epoch”.

The driving force for the dramatic war winter 1939/40 were the huge naval warfare activities in the coastal and regional seas of Europe, particularly in the North and Baltic Sea. Before the naval war went global since the Japanese ambush on Pearl Harbor in early December 1941, the war activities at sea were close to the European continent, which contributed, if not caused alone, the two further extreme severe war winters 1940/41 and 1941/42.

With a minimum of interest of science the three war winter can be sufficiently connected to human activities in the North Sea and Baltic since September 1939, due to the fact that these seas are fairly shallow (90m/55m), storing heat during the summer and releasing it in winter. It works like spoon stirring hot coffee, attracting cold air from Siberia (More HERE). In this respect they serve as confined research regions, like a unique field laboratory experiment. Each of the three winters produced its own finger-print, of which the most prominent are mentioned.

Winter 1939/40: From 1st September 1039 on the Southern North and Baltic Sea were covered by unprecedented activities from navigation, shelling, bombing, sea mines and so on. Very soon temperature fell from Brussels to Kaliningrad to levels not seen for several generations, and sea ice cover for many dozen years. In Berlin January and February temperature were second to the coldest ever recorded after 1709.

Winter 1940/4: During 1940 military activities concentrated from Narvik to Brest, and since April while occupying Norway, particularly affecting the Skagerrak aera. Subsequently the winter ‘cold pole’ covered Southern Norway, Western Sweden and Northern Denmark.

Winter 1941/42 is a particular illustrative case. The ambush on Russia since June 1941, included intensive naval warfare in the Eastern Baltic over seven months until sea ice prevented further activities. The Baltic region was thrown back to Little Ice Age condition, for example into the coldest winter in Stockholm since 1756, and unbelievable condition in Tallinn.

While the period of global cooling (1940 to mid-1970) commenced in Europe received its lasting impact by naval activities across the oceans of the Northern Hemisphere. The North Atlantic was naval battleground since the 1st September 1939 in the (1939–1945), which was extended in the Pacific west of Hawaii from December 1941 to 1945. Both oceans have a very complex temperature, salinity and current structure, great depths, and a mean temperatures of merely about 4°C. In this delicate marine environment, many ten-thousand war ships plugged the sea, and many billion objects exploded and sank to the bottom of the sea, over several dozen meters or thousand kilometers. Impossible that the sea structure (temperature and salinity) was not severely affected, and the ‘natural sea current profile’ not so heavily altered and diverted that it took at least one generation to erase the war impact, which lasted until about the 1970s. The attached temperature maps hardly allow another conclusion. As science has done nothing for understanding and proving anything in this respect.

The story about anthropogenic climate change is by far not understood and sufficiently explained.