What if I told you that global warming is not caused by man (not alone, at least) but it's a global natural (maybe even cosmic) cycle which happens every 62 million years?

The source supporting my claim is this article:

https://www.skepticalscience.com/climate-change-little-ice-age-medieval-warm-period-intermediate.htm

Among other things, it avers that the last global warming happened in the Cretaceous, 65 million years ago. It doesn’t correspond (for which the question wouldn’t have meaning then, obviously), but I did some research and it seems that (for those wondering, I told it’s further research, so it’s not included in the article but you can find it if you Google it) 3 million years ago, Central America rose up from the ocean, destibilizing ocean currents and leading to an oscillation between ice ages and warm periods. So, what do you say in response to my question (please, include the source(s) when answering, in case you did research :-) )?