65 million years of climate change: a graph from Wikipedia

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Climate change during the last 65 million years. The Paleocene–Eocene Thermal Maximum is labelled PETM.

It is argued that climate change may cross tipping points^[33] where elements of the climate system may 'tip' from one stable state to another stable state, much like a glass tipping over. When the new state is reached, further warming may be caused by positive feedback effects,.^[34] An example of a proposed causal chain leading to runaway global warming is the collapse of Arctic sea ice triggering subsequent release of methane.^{[35]
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 Climate engineering

If I'm reading this graph correctly it hasn't been this warm for at least 65 million years or more. Also, if I'm reading this correctly there hasn't been a 76 degrees Fahrenheit average at the north pole during this time followed by 1 million years of ferns to bring the temperatures back down once again during that 65 million years. 

I just made a second attempt at trying to understand this graph. It is a polar ocean equivalent during these times of 65 million years. So, definitely now I realize polar oceans have not been this warm for 65 million years. So, either it is caused by humans a pole shift or a Geomagnetic excursions or other factors too or everything at once.

The last very brief complete reversal:
A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field dropped to 5% of its present strength.^[2] Brief disruptions that do not result in reversal are called geomagnetic excursions.

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Anytime

1. Geomagnetic reversal - Wikipedia, the free...

   en.wikipedia.org/wiki/Geomagnetic_reversalCached

   A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. The Earth's field has ...