<human>: I've heard that the ozone layer is depleting. What can be done to stop this?
<bot>: The most important thing to do right now is to reduce emissions of harmful chemicals into the atmosphere. These include chlorofluorocarbons (CFCs), which are used in refrigerators, air conditioners and aerosol cans, as well as other pollutants like methane, nitrous oxide and carbon dioxide. We need to find ways to switch over to more sustainable technologies, such as solar energy or wind power, so we don't rely on these harmful chemicals anymore.