A few months ago, blog reader, longtime friend and Ph.D. scientist/oceanographer Walt McKeown asked me why I hadn’t written anything on climate change, given the clear threat it presents to everything we value in life and, indeed, to life itself on many parts of our globe. I answered that I didn’t feel I had much to add to a topic that has been exhaustively covered by others who have serious credentials in the matter. So it is with some irony that I note recent comments by Senator Marco Rubio and others of similar bent who acknowledge they have no credentials…