I know perfectly well that the earth warms and cools. Everybody knows that. I haven't believed a word written by the climate scam artists because they conveniently lose their data, make declarations based on data sets nobody can ever find again, massage their data with weird numbers only they can comprehend and use bad and corrupt data to start with. They pretend to measure the exact temperature of the earth (all of it evidently) to 1/10th of a degree. Nobody can measure the temperature of every room in their own house to that degree but they can tell you how warm it was to the 10th degree in 1066 when the Normans came ashore. On every point of the globe.
Setting aside the above, the scam artists also purport to find the effects of temperature in fossil records. The wheels came off that one long ago but still they persist. Here is where even the IPCC admits it got it all wrong.
I'm going back out on my limb and saying that global temperature is mostly driven by one of these: