Me being to lazy to look this up... Was the last major shift in the 90's? I remember some really funky weather (real winter, not the stuff its been for the last 20-ish years) and a few volcano's erupting around the world (probably related to the major winter shifts with the ash and solar cooling effects).
The last Grand Solar Minimum was what is known as the Little Ice Age (Caused by Maunder (1645 to 1715) and Dalton (1790 to 1830) minimums).
If you want to have a look into it, there was a very recent video (yesterday) on Tom Nelson's channel that goes over it, and some of the reasons behind the periodic Solar minima (harmonics in the various periodic oscillations of magnetic fields of the Sun). https://www.youtube.com/watch?v=SawIG4TNpHQ [Valentina Zharkova: Grand solar minimum is underway | Tom Nelson Pod #278 - 1:13:10]
The 90s was mostly dominated by the warming phase of the AMO/PDO Ocean current cycles, which were used as the basis for the "Global Warming" panic by blaming that natural temperature increase on CO2 (because you can tax CO2 and use it to control people).
Awesome, thank you. Ill look into it more. I do remember reading about it some. Wasn't the "worst winter in history" recorded during that time? Crop failures all over the world and such. I think I remember some reports that parts of the world didn't see the sun for at least 8 months and others had 10+ feet of snow in areas that usually got inches.
What you're probably thinking of is 1815, which was known as "The year without a Summer". This was right in the middle of a Grand Solar Minimum and also had the Mt Tambora eruption (major volcanic eruptions coincide with Solar minima, which is likely due to increased Cosmic Ray flux due to the diminished Solar magnetic field). Major volcanic eruptions, and effects similar to Solar Minima can also be caused by galactic events such as Super Nova, which hit Earth with massive Cosmic Ray fluxes. It appears that it is the Cosmic Rays that are triggering of the volcanic activity, which is due to nucleation of gas bubbles in magma that is saturated or super-saturated with dissolved gasses.
If you're not familiar with Tom Nelson's channel, it's great to hear about heterodox climate science. He has a wide variety of guests on and they are allowed to present their ideas openly. Strangely, the main stream climate scientist don't seem too keen to present their theories in detail.
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