 |
| environmental science: 62 phrases in 17 subjects |
| Astronautics | 3 |
| Ecology | 9 |
| Education | 1 |
| Energy industry | 14 |
| General | 2 |
| Makarov | 7 |
| Medical | 3 |
| Meteorology | 1 |
| Military | 6 |
| Oil and gas technology | 1 |
| Production | 1 |
| Scientific | 1 |
| Technology | 4 |
| United Nations | 3 |
| United States | 2 |
| Water supply | 3 |
| Weapons of mass destruction | 1 |