Environments at Risk is designed as an introductory text and uses case histories of environmental impact assessment to raise issues important in controlling environmental problems. This approach is novel as is the concentration on assessment procedures. In his twenty years of involvement with such cases, Professor Ellis developed his own method of approach for auditing environmental impact assessments, a method which will help readers appraise similar cases in which they are involved, either as concerned citizen, environmental managers or assessors.Environments at Risk is designed as an introductory text and uses case histories of environmental impact assessment to raise issues important in controlling environmental problems. This approach is novel as is the concentration on assessment procedures. In his twenty years of involvement with such cases, Professor Ellis developed his own method of approach for auditing environmental impact assessments, a method which will help readers appraise similar cases in which they are involved, either as concerned citizen, environmental managers or assessors.1 Introduction.- 1 Working Concepts.- 1.1 Risk and Assessment.- 1.2 Impact and Recovery: Ecological Catastrophe and Succession.- 1.3 Timing.- 1.4 The Patterns of Risk and Impact.- 1.5 Organisation and Communication.- 1.6 Interaction.- 1.7 Summary.- 2 Assessments.- 2 Construction Hells Gate (Canada).- 2.1 The Risks.- 2.2 The Problem and Its Remedies.- 2.2.1 Location, Impact and Timing.- 2.2.2 Assessments; Biology.- 2.2.3 Remedies.- 2.2.4 Participants.- 2.3 Issues.- 2.3.1 Research and Development.- 2.3.2 Native Rights.- 2.3.3 Delays.- 2.3.4 Values and Costs.- 2.3.5 Construction Risks.- 2.4 Summary.- 3 Chemicals Minamata (Japan).- 3.1 The Risks.- 3.2 The Problem and Its Resolution.- 3.2.1 Location.- 3.2.2 Minamata Disease.- 3.2.3 Timing.- 3.2.4 Assessments.- 3.2.4.1 Epidemiology.- 3.2.4.2 The Hunt for the Cause.- 3.2.4.3 Mapping Mercury.-l&