What is Reddit's opinion of Catastrophe: An Investigation into the Origins of Modern Civilization?

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I did find this:

https://www.amazon.com/Catastrophe-Investigation-Origins-Modern-Civilization/dp/0345408764/ref=nodl_

Also, there are a few scholarly articles out there on this subject if you search jstor. Seems like more evidence has been discovered since 2018 and many do seem to support a theory involving a volcano.

I have a book on it. I think it is called "Catastrophe."

Ah, just found it on Amazon.

https://www.amazon.com/Catastrophe-Investigation-Origins-Modern-Civilization/dp/0345408764

Late reply, but there is a wonderful 2-part documentary on the 535 AD eruption from the PBS series "Secrets of the Dead" called "Catastrophe!" based on the book Catastrophe: an Investigation into the Origins of Modern Civilization by David Keys.

Catastrophe! part 1 -- Catastrophe! part 2

Long story short: Keys started out on his research journey on the cause of an extreme global cooling period in the AD 500s after he had attended a lecture by the Northern Irish paleoecologist Michael Baillie (this is discussed around the 04:00 mark in the part 1 link above). Baillie and his colleagues had studied tree ring growth in Ireland and created a database of tree ring measurements from felled wood used in ancient buildings, comparing them to the rings in wood from trees with known felling dates. This is what led him to discover that trees all over Northern Europe (and in fact, all over the world) that had lived through the 6th century had experienced a few years of little to no growth during that time.

I don't know how his reputation is