That's a bad assumption. The Earth's system is an ongoing fluctuation. This is a stupid article. Here's why:
"Then, 10,000 years ago, the wild fluctuations stopped, and the climate settled down to the balmy, stable state that the world has enjoyed since then. At about that time, perhaps coincidentally, perhaps not, mankind started to progress."
Total crap. The flucuations didn't stop 10,000 years ago. Ever hear of the Little Ice Age? The Medieval Warm Period? Two major fluctuations in just the last 1,000 years. There are others during the history of civilization. Do some reading.
Did you read the world "wild" in the statment you then countereed with the "little" ice age and "minor" warming.
Reading comprehension my FRiend.