For example, the French revolution was primarily caused by the ongoing eruptions of Icelandic volcanoes which changed the weather in France so much that people were starving if they were not upper class royalty or middle class. When their needs were not met they guillotined the King and Queen in the 1790s.
Here is the incident:Year 1783 – 1784. Skaftáreldar take place. A long with a eruption in Grímsfjall volcano. Lava flows over a area of the size 580 km². Volcano gasses and did create famine and shortage of green grass for live stock around most of Iceland. Effects of this eruption was felt over in Europe and most of northern hemisphere. end quote from:
http://www.jonfr.com/volcano/?p=765
Apparently, it changed the weather from 1783 until 1789 or longer much like Krakatoa did about 100 years later. So, as the bad crop years went on eventually by 1789 the poorer people were starving and so revolted against the King And Queen of France and guillotined the King and Queen and much of the aristocracy of France from 1789 until 1799.
So, though volcanic eruptions might reduce the sun from pyroclastic glass dust particles it also might cause starvation in some areas because of not enough sun getting through to grow crops in some areas of the planet. However, it is a potential emergency action to consider to reduce temperatures when storm winds are more regularly above 100 mph worldwide. By reducing temperatures the air cannot hold as much moisture and so there would be less high winds and less extreme flooding because when air is cooler it can't hold as much moisture and also cooler air makes the winds go slower because most winds are caused by hot fast rising air and the planet's spin.
So, using pyroclastic dust (glass dust from melting rock from the magma) to lessen the amount of sun that reaches the earth reduces temperatures but also reduces growing seasons and could cause starvation some places as well.
Here is what the 1883 Krakatoa eruption did to the world's climate (from wikipedia):
Global climate
In the year following the eruption, average Northern Hemisphere summer temperatures fell by as much as 1.2 °C (2.2 °F).[9] Weather patterns continued to be chaotic for years, and temperatures did not return to normal until 1888.[9] The record rainfall that hit Southern California during the “water year” from July 1883 to June 1884 – Los Angeles received 38.18 inches (969.8 mm) and San Diego 25.97 inches (659.6 mm)[10] – has been attributed to the Krakatoa eruption.[11] There was no El Niño during that period as is normal when heavy rain occurs in Southern California,[12] but many scientists doubt this proposed causal relationship.[13]The eruption injected an unusually large amount of sulfur dioxide (SO2) gas high into the stratosphere, which was subsequently transported by high level winds all over the planet. This led to a global increase in sulfuric acid (H2SO4) concentration in high level cirrus clouds. The resulting increase in cloud reflectivity (or albedo) would reflect more incoming light from the sun than usual, and cool the entire planet until the suspended sulfur fell to the ground as acid precipitation.[14][citation needed]
end quote from:
1883 eruption of Krakatoa - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/1883_eruption_of_Krakatoa
The 1883 eruption of Krakatoa in the Dutch East Indies (now Indonesia) began ...
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A short history of volcano eruptions in Iceland - Jón Frímann ...
www.jonfr.com/volcano/?p=765
Apr 3, 2011 - Here is a short list of known eruptions in Iceland since the year 900 (or around that time). There might be missing eruptions because of lack of ...1980 eruption of Mount St. Helens - Wikipedia, the free ...
en.wikipedia.org/wiki/1980_eruption_of_Mount_St._Helens
In 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in state of Washington, in the United States. The eruption (which was a VEI 5 ...
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However, there are many places on earth where food is not grown like the polar ice caps (at least for now) and if we want ice to remain on the ice caps this might be done by releasing pyroclastic glass (powdered glass from melted rocks in magma) into the upper atmosphere there.
This might modify climate changes to earth and allow us to keep the ice caps whether or not we are able to reduce carbon emissions or not.
However, at a certain point it might not matter what we do if the carbon emissions are too great to be overcome by anything we likely will return eventually to 76 degrees Fahrenheit (average temperature)at the north pole as it once was before. It took 1 million years of a whole lot of ferns from the north pole south to the equator to eat up enough carbon dioxide to reduce that temperature back down to what it was at the beginning of the 20th century at the north and south poles.
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