Plus, we don't know all of the "systems" we need to know to figure out which way things are headed.
What I do understand is that the average global temperature goes up or down relative to the last average global temperature, and it does so on a daily basis, on a weekly basis, on a monthly basis, on an annual basis, on a decade basis, on a century basis, on a millenial basis, and on all sorts of basis in between, or larger than those I've named. Up and down, all the way!
Picked this out of the comments to the article at WUWT....