Then their was the end of the Old Kingdom of Egypt around 2500 years ago.
Then their was the end of the Minoan Warm period around 1500 years ago.
Then the end of the Roman warm period around 350 AD.
Then the Middle ages warm Period 1200 AD.
Seems like a pattern to me.
Researchers were trying to determine why Stradivarius violins sound so great. Why, they asked, can't you use the same materials and methods Stradivarius used, and get an identical product?
The wood was the answer, they claimed. The Spruce wood was much denser and closer-grained than modern trees grown in the same area. Why? Those trees grew up in the Little Ice Age, growing much more slowly, with tight rings and close grain, compared to today's trees.
Now, if trees grow so much slower, how about food crops?