52 ENVIRONNEMENT | MT 5216 détérioration de l'environnement | BT1 pollution | RT acide [6811] | désertification [5216] | pluie acide [5216] | sécheresse [5216]
52 ENVIRONMENT | MT 5216 deterioration of the environment | BT1 pollution | RT acid [6811] | acid rain [5216] | desertification [5216] | drought [5216]