If you have completed looking at these critical concepts of the case:

• That chlorofluorocarbons appeared to ideal materials for refrigerants,
• That their presence in the stratosphere was a totally expected consequence of their stability,
• And that Rowland and Molina developed a hypothesis based on theoretical grounds that chlorofluorocarbons in the stratosphere would prove damaging to the important ozone in the stratosphere,

Then try to see yourself as a scientist in 1980 and plan a study to identify if the proposals of Rowland and Molina were correct.