The Battle Over Climate Science

Mann directs Penn State University’s Earth System Science Center. Several months ago, he arrived at his office with an armload of mail. Sitting at his desk, he tore open a hand-addressed envelope and began to pull out a letter. He watched as a small mass of white powder cascaded out of the folds and onto his fingers. Mann jerked backward, letting the letter drop and holding his breath as a tiny plume of particles wafted up, sparkling in the sunlight. He rose quickly and left the office, pulling the door shut behind him. “I went down to the restroom and washed my hands,” he says. “Then I called the police.”

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