Hey there! Am currently writing a response to your other message. Having to move slowly today as the kids seem to be requiring more attention than usual. Probably the effect of the full moon ;)

Good to see @bloom has pushed your comment up to the top here. It is an important question you bring up and a tricky one to answer with any degree of certainty. However, if we can acknowledge that the sun controls our climate, we must also acknowledge that it is dramatically larger than the earth. So if we think about it as a massive generator somehow powering a tiny little earth, it is hard to imagine how humans (proportionally speaking) have any effect at all. The sun must surely be the more powerful driving force?

I think I am right in saying that we know Greenland was nearly ice-free for extended periods during the Pleistocene period, so can we not assume from this that when the ice caps melt it is not because of humans? Though it seems to me there is plenty of evidence that the greenland ice sheet is expanding. You will find lots of articles linking to this evidence here