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The petition asks the news media to abandon the most frequently used term for people who question climate science, “skeptic,” and call them “climate deniers” instead. By Degrees A column by Justin Gillis about our changing climate. 3.6 Degrees of Uncertainty DEC 15 A Tricky Transition From Fossil Fuel NOV 10 Shining Star Power on a Crucial Subject SEP 22 In the Ocean, Clues to Change AUG 11 Picking Lesser of Two Climate Evils JUL 7 See More » Climate scientists are among the most vocal critics of using the term “climate skeptic” to describe people who flatly reject their findings. They point out that skepticism is the very foundation of the scientific method. The modern consensus about the risks of climate change, they say, is based on evidence that has piled up over the course of decades and has been subjected to critical scrutiny every step of the way.

The most simplistic of climate deniers are those who looked out their windows this winter, saw that it was snowing, and reasoned that global warming therefore can’t be real. This speaks to a basic confusion of the difference between weather and climate. (If you’d like a much more thorough debunking of weather-based climate change denial, read this.)It’s also a classic example of confirmation bias: Deniers get giddy when it snows because it appears to confirm their belief that Earth isn’t really getting warmer. To understand why that doesn’t make sense, one need only look at the average global temperatures. Yes, it was very cold in parts of the U.S., but zoom out and it becomes clear that last month, overall, was the fourth-warmest January in recorded history.In some cases, it could be a fear of science that is driving this type of thinking.

A misunderstanding of what scientists take as “proof” may also be responsible for this confusion.

"A MAN WITH A CONVICTION is a hard man to change. Tell him you disagree and he turns away. Show him facts or figures and he questions your sources. Appeal to logic and he fails to see your point." So wrote the celebrated Stanford University psychologist Leon Festinger [1] (PDF), in a passage that might have been referring to climate change denial—the persistent rejection, on the part of so many Americans today, of what we know about global warming and its human causes. But it was too early for that—this was the 1950s—and Festinger was actually describing a famous case study [2] in psychology. Festinger and several of his colleagues had infiltrated the Seekers, a small Chicago-area cult whose members thought they were communicating with aliens—including one, "Sananda," who they believed was the astral incarnation of Jesus Christ. The group was led by Dorothy Martin, a Dianetics devotee who transcribed the interstellar messages through automatic writing.

In the annals of denial, it doesn't get much more extreme than the Seekers. They lost their jobs, the press mocked them, and there were efforts to keep them away from impressionable young minds. But while Martin's space cult might lie at on the far end of the spectrum of human self-delusion, there's plenty to go around. And since Festinger's day, an array of new discoveries in psychology and neuroscience has further demonstrated how our preexisting beliefs, far more than any new facts, can skew our thoughts and even color what we consider our most dispassionate and logical conclusions. This tendency toward so-called "motivated reasoning [5]" helps explain why we find groups so polarized over matters where the evidence is so unequivocal: climate change, vaccines, "death panels," the birthplace and religion of the president [6] (PDF), and much else. It would seem that expecting people to be convinced by the facts flies in the face of, you know, the facts.

Losing the night sky would have big consequences, said Dacher Keltner, a psychology professor at the University of California, Berkeley. His recent work looks at the health effects of the emotion of awe. In a study published in January in the journal Emotion, he and his team found that people who experienced a great deal of awe had lower levels of a marker of inflammation that has been linked to physical and mental ailments. One major source of awe is the natural world. “When you go outside, and you walk in a beautiful setting, and you just feel not only uplifted but you just feel stronger,” said Dr. Keltner, “there’s clearly a neurophysiological basis for that.” And, he added, looking up at a starry sky provides “almost a prototypical awe experience,” an opportunity to feel “that you are small and modest and part of something vast.”