 |
| environmental chemicals: 15 phrases in 10 subjects |
| Ecology | 4 |
| Energy industry | 1 |
| Environment | 1 |
| General | 1 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 1 |
| United Nations | 3 |
| Water supply | 1 |
| Weapons of mass destruction | 1 |
|
| environmental chemicals: 15 phrases in 10 subjects |
| Ecology | 4 |
| Energy industry | 1 |
| Environment | 1 |
| General | 1 |
| Makarov | 1 |
| Natural resourses and wildlife conservation | 1 |
| Technology | 1 |
| United Nations | 3 |
| Water supply | 1 |
| Weapons of mass destruction | 1 |