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OZONE LAYER (41) |
OZONE-DEPLETING SUBSTANCES (41) |
OZONE (37) |
REFRIGERATION (19) |
HYDROFLUOROCARBONS (12) |
HYDROCHLOROFLUOROCARBONS (8) |
GLOBAL WARMING (5) |
METHYL BROMIDE (5) |
AIR-CONDITIONING (3) |
CHEMICALS (2) |