i have been looking into this notion of anthropogenic global warming and i have come to a rather interesting conclusion.  my conclusion is that there is indeed Mannmade global warming.  Now i'm sure the eagle-eyed among you have  noticed i have not spelled the 'title' of global warming 'correctly', that is, i have spelled it using a person's proper last name.  This is indeed deliberate and not without reason.  I stated it this way because if you study 'global warming', you will find that this notion of global warming is based on the work of an individual by the name of Michael Mann, a former professor of the University of Virginia.  I call it 'mannmade global warming' because Mr. Mann and his associates created a graph that purportedly showed a stable climate from before 1000AD till around 1990.  Conveniently, his 'data' 'showed' that temperatures spiked during the 1990's.  In the event you do not know what i am referrring to, this graphical illustration was later referred to a hockey stick becuase the alleged temperature spike allegedly occurring during the 1990's resembled a hockey stick blade and the preceding graph resembled the  long handle leading up to the blade, or temperature spike.  Well, interestingly enough, this mannmade creation has since been debunked, by two Canadiens, Steve McIntyre and Ross McKitrick.  And, since these 'M&M' boys debunked the 'Hockey Stick' graph, it has since been debunked by the NAS.  In my mind there can only be one conclusion. There is NO anthropogenic global warming.  I still maintain that there is Mannmade global warming and i do so because i am told there are still some diehard environmentalist who hold on to the Hockey Stick graph as the 'Holy Grail' of climate change