Again and again environmental activists wrap themselves in a cloak they call "science".  While doing so, they mix their data set origins, and even "adjust" the data itself so as to support a pre-determined conclusion. The underlying assumption is that climate change is primarily anthropogenic, and this must not be challenged.   Any contrary data are ignored, explained away, or "adjusted".  Scepticism is not tolerated.  

This behaviour is, in fact, profoundly unscientific.  Science does not massage the facts, but looks for better ways to explain them.  It questions what we think are facts.  The environmental movement behaves more like a religion.  

Those of us who question the science find ourselves referred to as "deniers", an odious reference to deniers of the historical fact of the holocaust.  This has the same effect as the epithet, "heretic", five centuries ago.

Professor Homer-Dixon's moralizing does not convince me of the truth of his underlying assumptions.