Could you tell me more about your theory and its time frame. I have written details at other Catastrophism posts, but the pressure of deadlines is keeping me from responding with details immediately.
In a nutshell, roughly every 100K years since the Cenozoic Era, something occurs that causes a global warming period lasting for about 10K years before the Earth returns to its normal colder climate.
What ever causes the warming, it ends rather quickly. Perhaps the cause is the Sun entering an active phase, a decrease in the amount of space dust in the solar system, some characteristic in eccentricity of the Earth's orbit or a periodic release of heat from the Earth's interior or any combination of the above. It's my way of thinking about global warming or cooling in reverse and it's time for the warm period to end.