This document defines key terms related to environmental protection such as petrol, oil, chlorofluorocarbons, habitat, waste, recycling, pesticides, and the ozone hole. It explains that petrol and oil produce pollution like carbon dioxide when burned. Chlorofluorocarbons correspond to hydrocarbons where hydrogen is replaced by chlorine and fluorine, and they damaged the ozone layer. Other terms like habitat, waste, recycling, and pesticides are defined in brief.