I quite agree with the first part of you speech, concerning the importance of identifying the base of the problem. I don't think it's that easy because the gentle warm-up (the natural part) is a step in an oncoming global event.

Most peoples think that human will increase the rate of this event but it's after all a natural event.

As far as I know, human can't do anything against a natural force. This warm-up will lead to a snowball Earth. Knowing that's there is nothing to do, the best is to anticipate the progression of the glaciers and manage the low latitude regions to recieve the amount of living things.