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- ecological and economic efficiency 1
- ecological aspect 1
- ecological construction 1
- ecological development 1
- ecological efficiency 2
- ecological factors 1
- ecological imperative 1
- ecological index 2
- ecological marketing 1
- ecological modernization 1
- ecological production 2
- ecological safety 1
- ecological technologies 1
- ecological value 1
- ecological-economic theory 1
- ecologicality 1
- ecologically-clean resource saving technologies 2
- ecologization 1
- ecology 10
- ecology old development 1