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Testing the hypothesis of ozone depletion (1 of 3) Image caption: Molina and Rowland needed to test their ideas with actual atmospheric evidence, but figuring out just what evidence to look for was tricky. << Back to search results

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Testing the hypothesis of ozone depletion (2 of 3) If CFCs are destroying the ozone layer, then we would expect/predict that more CFCs will be present at lower altitudes.

Testing the hypothesis of ozone depletion (3 of 3) Chlorine monoxide is one of the products of ozone destruction. Since there is no other known source of chlorine monoxide, finding this chemical in the upper atmosphere would strongly support the idea that chlorine is destroying ozone.