Interesting point.....and I think it has merit...though, as you say, it's a bit disconcerting.  I don't discuss climate change with "deniers"... I simply say "hey, we're way beyond the discussion stage.  it is a FACT and the only thing to discuss now is just what are we willing to do about it.  

Let's have coffee or a beer sometime and discuss this one.  regards, Gary crum