（40）Recyclable product                                     （41）Renewable resources
（42）Conserve natural resources                         （43）Plastic bags
（44）Greenhouse effect                                      （45）Global warming
（46）Acid rain                                                   （47）Energy crisis
（48）Oil leakage                                                （49）Environment awareness
（50）Pest rampancy                                           （51）Rescue and relief work
（52）Garbage disposal