The earth moves in milankovitch cycles around the sun which are a mayor contributor to warming and cooling cycles.
The ice core data shows also that increases in CO2 concentration followed after the temperature rose first which could correspond to the milankovitch cycles. The greenhouse effect takes places which leads to faster temperatures rises and humans are definitely contribution to that, which might already have changed how the world will look in the future.
Could youn link me to the record temperature rising right now in the last 100 million years please?