What happened to the hole in the Ozone layer?
The 1980s were a time of great concern for the world, as a rapidly expanding hole in the ozone layer threatened life on Earth. The ozone layer, composed of ozone molecules dispersed in the stratosphere, absorbs about 98% of the Sun’s ultraviolet radiation, protecting plant and animal DNA from damage. However, two chemists, Mario Molina and Sherwood Rowland, discovered in the early 1970s that widely used chemicals called chlorofluorocarbons, or CFCs, could upset the delicate balance of the ozone layer.
