 |
| |||
| ozone depletion; depletion of the ozone layer | |||
| ozone layer depletion | |||
| appauvrissement de la couche d'ozone: 6 phrases in 2 subjects |
| Environment | 5 |
| United Nations | 1 |
|
| |||
| ozone depletion; depletion of the ozone layer | |||
| ozone layer depletion | |||
| appauvrissement de la couche d'ozone: 6 phrases in 2 subjects |
| Environment | 5 |
| United Nations | 1 |