By 1970 it was well established that ultraviolet light from the sun contributes to skin cancer.
Topic
The effects of chlorofluorocarbons (CFCs) on ozone depletion and the resulting public policy response.
Framework
Problem / Solution
Main Point
Molina and Rowland discovered that CFCs deplete the ozone layer, which protects us from cancer-causing ultraviolet radiation, prompting international policy change to control these pollutants. (Paragraph 2) This is wrapped up in Paragraph 4, where it summarizes the outcome:
P1: Importance of the Ozone Layer
By 1970, it was understood that ultraviolet radiation from the sun can cause skin cancer, but thankfully Earth's ozone layer filters out much of this harmful radiation.
P2: Discovery of the Ozone Problem
Scientists Molina and Rowland revealed that man-made chemicals called CFCs, found in products like aerosols and refrigerants, break down in the upper atmosphere and release chlorine, which destroys ozone. A single chlorine atom can wipe out thousands of ozone molecules.
P3: The Lasting Threat and Call to Action
Their research showed that even if we stopped using CFCs immediately, the chemicals already present would keep damaging ozone for many years. Molina and Rowland pushed for urgent public policies to address this environmental danger, leading to political attention and involvement in research committees.