Reflecting on incendiary comments from Paul Krugman, R. K. Pachauri, James Hansen, and Bill Nye, William Briggs has an interesting suggestion:

Treason. Conspiracy. Crimes against humanity. Unpatriotic. These are not words to use lightly.
And they were not. They were not spoken in the heat of the moment. They were considered.
They describe crimes historically punishable by imprisonment and death. We can only infer that their use is driven by bloodlust and a pathological inability to accept criticism.
These words are bludgeons; raw, brute-force weapons. They are threats meant to silence utterly any who would dare speak up.
They are also fighting words, slaps in the face.
But since I paid attention to my catechism, I will this time turn the other cheek. Instead of punching back, I make a plea.
I call on Gavin Schmidt, Kevin Trenberth, Tom Wigley, Phil Jones, and other top global warming scientists to repudiate the language used by Messrs. Krugman, Pachauri, Hansen, and Nye. Scientists — especially in the wake of “climategate” — should issue a public statement admitting that criticism is not treasonous, is not conspiratorial, is not a crime against humanity, is not unpatriotic.
They are free to say that any or all criticism is factually wrong, or likely to be. But it is not morally wrong to offer it.

Gavin Schmidt repudiate comments from James Hansen? We won’t hold our breath.