ENSC 201 Lecture Notes - Lecture 4: Lt50, Precautionary Principle
22 Aug 2016
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Document Summary
Silent spring exposed hazards of ddt and catalyzed public rejection of ddt. Regulation of toxic substances: information from scientific research will guide regulation, social & economic factors can also influence regulation, goal: to establish safe limits. Purpose: to establish degree of safety, ideally expressed in a quantitative manner. Evaluation of likelihood that exposure to a named chemical may cause harmful environmental effects: effects can be direct or indirect, based on scientific measurements on scientific judgment. Differs from human health risk assessment: scope (human vs all biota and ecosystem functioning, research/data. **key takeway: assessment of environmental risk for potentially toxic substances incorporates inherent toxicity and probability of exposure to a particular substance or family of substances. Alternative terminology (environmental risk assessment: project formulation, analysis, risk characterization, parties involved. Includes policy, regulations, resource management goals, societal values: characteristics of the stressor, ecosystem, assessment/measurement endpoints, conceptual model, analysis plan. Characterization of ecological effects (effects assessment, dose-response assessment)
