Er, did you read that, before posting the link - It rather supports the idea that the climate has always changed, leading to the rise and fall of civilisations.
Quote from the link:
"After all, it was when weather patterns finally became predictable about 11,500 years ago that complex civilizations finally formed in the first place. A stable climate ensured that crops would grow year after year, and a reliable source of food freed people to settle down and develop culture."
And Greenlands ice sheet was particularly stable:
![blog__inline--how-did-earth-get-its-long-standing-stable-climate-2.jpg](http://reasons-prod.storage.googleapis.com/cms/images/default-source/blogs/blogs-inline/blog__inline--how-did-earth-get-its-long-standing-stable-climate-2.jpg)