<human>: I've heard that the ozone layer is being depleted. What is causing this?
<bot>: The main cause of ozone depletion is the release of chlorofluorocarbons (CFCs) and other chemicals into the atmosphere, which depletes the ozone layer by breaking down the molecules that make up the ozone layer. These chemicals are used in a variety of industrial processes, such as refrigeration and air conditioning, and they have been found to be responsible for about half of the ozone depletion observed since the 1970s.