The document discusses the causes of ozone depletion, including both anthropogenic (man-made) and natural pollutants. Anthropogenic pollutants that contribute to ozone depletion are industrial smog from cities, particulate matter from diesel exhaust and hydrocarbons, and fossil fuels such as coal and oil. Natural pollutants include volcanic eruptions that release greenhouse gases into the atmosphere and wetlands, termites, and oceans that produce 36% of methane emissions.