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EnricoPallazzo said:
Marth said:

The sun is currently very generous to us but it doesen't matter. We caused this shitshow ourselves.

Why was it stable from 1940 to 1980?

That was due to our energy production at the time. The sun did only effect this by about 0.01%

At the time (until the 1970's), most of the electric energy production was made rather inefficiently from very dirty coal. As a result they spewed tons of aerosols into the skies every year, especially sulfur. At the ground, these can affect our lungs and make serious diseases and cause cancer and was a major source of acidic rain and the yellowish, hard to breathe smog around cities with them, but high up in the air, they can reflect sunlight before it gets to heat up the atmosphere.

Once these got slowly phased out for other power plants (cleaner coal, petrol, natural gas and nuclear) during the 50's through 70's, the amount of aerosols in the higher atmosphere dropped down and with them their reflective power.

This is the reason why geoengineering is a thing btw, trying to replicate the effect by shooting aerosols high up above our weather systems exactly for this reflective effect. Volcanoes do it by themselves if they are strong enough, but that's too rare an occasion (last big one with a VEI of 6 or more was the Pinatubo eruption in the Philippines in 1991) to bank upon that.

It has a drawback, too. At the time, there were very few measuring stations in third world countries. But in those, the heating were mostly not interrupted since unlike with volcanoes who throw the aerosols very high and many more of them, the effect from coal power plants and other particle producing processes is mostly local or regional, not global. As a result any solar radiation management would need to be a concerted global effort to really work as intended.