There’s a very real possibility that this could happen any time. But nobody is self sufficient anymore. Millions would die.
Some have speculated that higher volcanic activity can occur during prolonged low solar activity periods. Not as far fetched an idea as it seems.
As far as that goes, transportation to a great extent mitigates regional crop loss. Likewise, preservation of food is much, much better today.
Even at the height of the Dust Bowl in the US, that wiped out tens of thousands of small farms, because of deflation and currency shortage, much of the agricultural production was not worth shipping to market. There was still far too much food being produced.
You are correct. What a run on grocery stores would be seen if a super volcano blew, or an asteroid hit, while Globaal Warming religionists would demand even more measures against CO2.
Rev. predicts great meteorological events, whatever they mean:
The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up. And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood; And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed. And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters; And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter. And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise. (Revelation 8:7-12)