But I think that&#x27;s true of everything, no?<p>Before people thoughts ulcers were caused by stress they probably thought it was due to too much &quot;humor&quot; and required treatment by bloodletting.<p>The point is that we advance scientific thinking by challenging ideas.  If right now most scientists thinking global warming is real, then fine.  Just don&#x27;t try and shutdown the ones that don&#x27;t agree.