Jacquie Milner has spent a lot of time looking up at the sky. She has been an amateur astronomer for the past 30 years, and has been doing outreach for various organisations, including Perth Observatory and, more locally, Mount Burnett Observatory, for 22 years. She even did a short stint under the dome in the Scitech Planetarium in Perth. For Laborastory she went back to her environmental science roots to talk about the atmosphere, and two men who saved an important part of it: Frank Rowland and Mario Molina.