You can not be both a scientist and a global warming crusader at the same time

"…we have to offer up scary scenarios, make simplified, dramatic statements and make little mention of any doubts we might have."

Benjamin Duffy takes on global warming.

Dr. Robert Giegengack of the University of Pennsylvania has firsthand knowledge of what it means to be working among scientists who double as advocates. When the Ivy League professor suggested that other sources (not simply carbon dioxide and other greenhouse gases) were responsible for the slight warming of recent years, he was shunned by some colleagues. "People would come to me and say: 'Stop talking like this. You're hurting the cause.'" In case you were wondering, the "cause" was not the unbiased pursuit of the truth, as you might expect from scientists. The "cause" was making the theory of manmade global warming as commonly accepted as gravity.

These advocate-scientists already know what they want the science to reveal. The evidence is then fitted to the theory, not vice-versa.