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Start to concern about..., Define risk space, Approach, Why we need to…

- - - - degree of clean-up and the level of clean-up that is satisfactory
- - - - Three books about continuous process of studying and refining risk assessment
        
        risk communication;
        
        toxicological and ecological risk assessment
        
        risk assessment of hazardous air pollutants
    - - ecological risk analysis
      - realisation that risk assessment can be used to determine environmental priorities
      - initiated a program, nowadays called comparative risk assessment, that compared the relative residual risks posed by a range of different environmental problems