Wonder what it would be like if this happened today
https://en.wikipedia.org/wiki/Little_Ice_Age
Would we have climate change scientists proclaiming the end of the World.
The climate changes quite regularly (Geologically speaking) and statistically the Earth is generally more warmer than it is colder.
The reason we had massive cold spots - certainly on the Southern Ice Cap is partly because of continental drift, making a big open area on the Southern Hemisphere, making it ideal for those conditions, in due course the continents will shift again and Antarctica will again be a tropical paradise, as it was a long time ago. (No doubt full of oodles of minerals too that will be harvested)
The reality is that we just don't understand why 'climate change' happens, and we should be wary of arbitrarily pointing the finger of blame at anything until we do.