Human: I've heard that the ozone layer is depleting. What can be done to stop this? Assistant: 
The ozone layer is a thin layer of gas in the stratosphere that absorbs ultraviolet (UV) radiation from the sun, protecting life on Earth from harmful UV rays. Ozone depletion is caused by man-made chemicals called chlorofluorocarbons (CFCs). These chemicals are found in aerosol sprays and other products. In order to reduce the risk of further damage to the ozone layer, countries around the world have agreed to phase out production and use of these chemicals.