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- ecological risks 2
- ecological safety 94
- ecological safety car 1
- ecological safety of energy 1
- ecological security 7
- ecological security of the state 1
- ecological service 1
- ecological services 2
- ecological settlement 1
- ecological situation 8
- Ecological Society 1
- ecological stability 2
- ecological standardization 1
- ecological standards 4
- ecological state 4
- ecological status 3
- ecological strategy 2
- ecological sustainability 1
- ecological system 7
- ecological systems 5