NBC News: “They live forever,” said lead author A. R. “Ravi” Ravishankara, who called them “immortal molecules.” Now a professor of chemistry and atmospheric science at Colorado State University, Ravishankara said he was concerned about the chemicals’ growing use at the time and what unintended impacts they might have on the environment. He warned that if chemicals in use are found to cause harm, “you just can’t take it away,” he said.

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