"Man has no impact on the Earths Climate".
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!
This about sums it up for me.