Who is going to explain the global cooling from 1940 to about 1970? 
When will NASA expert James Hansen do it?


Here placed on 10th April 2008


It is astonishing to see that the majority of scientists have fully embraced James Hansen’s ascertain he made 20 years ago, that men is responsible for global warming. But until now he and IPCC fail to explain why it came to three decade cooling period, although they know the facts since long.


Already back in 1981 the James Hansen’s team published their finding that, overall, Earth’s average temperature rose by about 0.4°C for the period from 1880 to 1978, but there was a global cooling from 1940-1970[1] that he considered subsequently as follows:  “I think the cooling that Earth experienced through the middle of the twentieth century was due in part to natural variability,” he said. “But there’s another factor made by humans which probably contributed, and could even be the dominant cause: aerosols.” Meanwhile it is widely claimed that a high concentration of sulphate aerosols in the atmosphere may have had a cooling effect on the climate because they scatter light from the Sun, reflecting its energy back out into space, by industrial activities at the end of the second world war. The way Hansen and his supporting colleagues handle the matter is insufficient for the following reasons:


The sulphate aerosols relation towards the mid-century global cooling should be checked against three facts, namely 

  1. the cooling started with extreme winters in Northern Europe in winter 1939/40; and 
  2. the temperatures were low during the winter season, when the effect of sulphate aerosols on sun ray was at the lowest, and thirdly
  3. the pre WWII industrial activities presumably had been much higher than immediately after the end of WWII in 1945[2]

 More important for understanding the global cooling after 1940 until about 1970 is the impact of the seas and oceans. To understand the extreme cold winters all over Northern Europe from 1939/40 to 1941/42, one has to consider the impact of the North- and Baltic Sea, for the global cooling one should take the North Atlantic and North Pacific into consideration, and what men did do with them during WWII, as thoroughly explained at


[1] David Herring, November 5, 2007, „Earth’s Temperature Tracker“ , NASA  at :

 [2] Actually only since 1950, annual car production has grown fivefold , starting with eight million, today about 40 million cars. Similar figures, if not higher, apply for aviation, electricity production, shipping, etc..