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The question: Will Trenberth refer to those who disagree with the scientific consensus - that human activities are very likely warming the climate system - as "climate deniers," which he did in an earlier version of his talk, thereby raising an outcry and a fusillade of emails from the climate skeptic blogosphere? he answer: Yes, he most certainly will.
Perhaps it's just human nature to dig in your heels when under attack for holding a particular viewpoint, or maybe Trenberth really believes that it's useful to use the term "denier" when discussing certain people who disagree with him. Whatever the reason or reasons, Trenberth does indeed show a slide entitled "The Deniers" during his wide-ranging talk, which touches upon the changing nature of extreme weather and climate events in a warming climate. Defending his use of a term that many climate change skeptics say they find offensive due to its association with those who deny the Holocaust, Trenberth defiantly tells the audience: "My reaction to some of them is, 'well, if the shoe fits, wear it.'" Trenberth continues, "Indeed they are deniers. They deny rather basic information about climate science." Without going into specifics, he says he does distinguish between "climate skeptics" and "climate deniers."
Trenberth notes that, leading up to the AMS meeting, he received hundreds of angry, and occasionally even threatening emails regarding his presentation. These emails arrived in his inbox after two popular climate skeptic websites - Climate Depot, which is the climate skeptic equivalent of the Drudge Report, and Watts Up With That - harshly criticized him for his use of the term (among other things). Both sites published his email address and encouraged readers to contact him regarding the upcoming presentation.
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http://voices.washingtonpost.com/capitalweathergang/2011/02/cooling_off_the_heated_climate.html