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- ecological development 1
- ecological efficiency 2
- ecological factors 1
- ecological imperative 1
- ecological index 2
- ecological marketing 1
- ecological modernization 2
- ecological production 2
- ecological safety 1
- ecological situation of the environment 1
- ecological technologies 2
- ecological value 1
- ecological-economic theory 1
- ecologicality 1
- ecologically-clean resource saving technologies 2
- ecologization 2
- ecology 13
- ecology old development 1
- economaizer 1
- econometric models 2