636705 external_news 1593701036 1593701036 “This is a giant, global environmental experiment that has been done in a very controlled way,” said Sally Ng, an atmospheric scientist and chemical engineer at Georgia Tech, who, in the first days after the shutdown, briefly returned to her lab in downtown Atlanta to install an atmospheric monitor on the roof. “We suddenly turned the knob off, very drastically, and now we’re very slowly turning it back on.”

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