Solar from 1940-80's during the war industrialisation rockets to manufacture machines of destruction, the only aim was production and this causes the release of large amounts of sulphur dioxide so much in fact that the smogs from the late 50's and early 60's as industrialisation increased rapidly caused many deaths from respiratory diseases.
This same SO2 happens to also reflect sunlight back into space and cuases a strong negative forcing add in all the particulates and it was like a huge volcano going off continuously across the western world, this not surprisingly stopped the general warming trend, there wasn't really a cooling more of a plateau. However this air pollution wasn't a good thing so we did something about, people coughing up their lungs in front of you is a good persuader as are forrests destroyed by acid rain. This therefore effectively removed most of this cooling influence from the atmosphere.
At the same industrialisation was increasing ever more rapidly in the name of ecomonic growth pumping more and more GHG into the equation (1950 -~1000mtonnes a year 2000 -~7000mtonnes a year), this rapidly increased CO2ppm from ~320-380 over that time period, and hence the warming influence of the GHg which has a lag of about 10 years due sea absorption of heat, started to become transparent about the early 1980's and onwards. SO the cooling period really is easily explained especially as natural forcings at that time alsi tended to a cooling effect.
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