Therefore, chemistry is required to understand the environmental issues. Ozone causes A, B, C. Acid rain causes A, D, E. Air pollution causes D, E, F. Etc. A, B, and C endanger life as we know it. The environmental issue that endangers life as we know it should be the highest priority. Therefore, ozone should be the highest priority environmental issue.
Ozone has the greatest impact on life.
The problem that has the greatest impact on life should be the highest priority. Therefore, ozone should be the highest priority.