What do the authors state is the goal of this analysis, and what do they ultimately conclude?

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5. Read the article by Solomon et al. (2016) titled: Emergence of healing in the Antarctic ozone layer (Science, 10.1126/science.aae0061, 2016).
(a) What do the authors state is the goal of this analysis, and what do they ultimately conclude? (b) Describe the measured O3 trends in Figs. 1 and 5.
(c) Explain the difference between the red and green lines in Figs. 1 and 5. How do the authors interpret their difference?
(d) The 1987 Montreal Protocol was tremendously successful at halting the emissions of chemicals responsible for stratospheric O3 depletion. Why then does the ozone hole persist? For example, 2015 was the fourth largest ozone hole on record.

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