John Christy, a professor of atmospheric science at the University of Alabama here, says he remembers the morning he spotted a well-known colleague at a gathering of climate experts.
“I walked over and held out my hand to greet him,” Dr. Christy recalled. “He looked me in the eye and he said, ‘No.’ I said, ‘Come on, shake hands with me.’ And he said, ‘No.’ ”
Dr. Christy is an outlier on what the vast majority of his colleagues consider to be a matter of consensus: that global warming is both settled science and a dire threat. He regards it as neither.
