Polar vortex the Sky is falling

[MonkMode]

Based on ice core data, the average temperature of the Earth was stable over the last 24,000 years or so, up until the beginning of the industrial revolution  (usually taken to be 1850). There were occasional fluctuations due to things like volcanic eruptions, and whatnot, but they were 100 times slower compared to today.  Today, we are a bit more than 1 degree C warmer than the preindustrial era, and almost all of that has occurred since 1975.  The rate of change today is about 0.2 degrees C per decade, it's all in the upward direction, and it tracks the increase in CO2 concentration in the atmosphere very closely. I don't think the rate of change has ever been this fast due to strictly natural causes.  The possible exception might be when the asteroid hit the Earth and formed the Chicxulub Crater near the Yucatan Peninsula.  That one killed the dinosaurs overnight.

I often look at the Younger Dryas graph for analysis of the last 20,000+ years. That is just analyzing layers of ice & snow, I’m not sure how effectively one can extrapolate average global fluctuation in temperature from that.

https://en.wikipedia.org/wiki/Younger_Dryas

I’m not sure any measurements dating back farther than that is worthy of much consideration.

As far as what the graphs tell us, seems Greenland snow has been piling up at a very steady rate for the past 10,000 years. 20,000 to 10,000 years ago saw more volatility.

And snow seems to be piling on at a declining rate in Antarctica for the past 20,000 years.

I don’t think there are many good records of global temperature data further back than 200 years ago. But the apparent increase in temperature during this time, I think is attributable to increased concentration of CO2 in the atmosphere.