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The six different selection criteria defined above can be grouped into two classes, according to whether the aim is to maximize the gain or to minimize the loss (ambitious versus cautious strategies). The ignorance about the behavior of complex environmental systems is so vast that it is often foolish to adopt anything but a cautious view of the outcome. 8, the: – Environmental impact assessor should produce information that fits the interpretative capabilities of analysts (see Fig. 7). Practically, the final information is inappropriate if it exists in one form only (such as tables).

Ocean c. Underground d. Qua1ity e. Temperature f. Snow, ice, and permafrost 3. Atmosphere a. Quality (gases, particulates) b. Climate (micro, macro) c. Temperature 4. Processes a. Floods b. Erosion c. Deposition (sedimentation, precipitation) d. Solution e. Sorption (ion exchange, complexing) f. Compaction and settling g. Stability (slides, s1umps) h. Stress-strain (earthquake) i. Recharge j. Air movements Environmental Impact Assessment 29 Table 3 (continued) Part 2: Environmental “characteristics” and “conditions” B.

It reveals areas where information seems inadequate, and, especially, it makes the participants in the assessment, who may have very different backgrounds, aware of each other’s problems. 4 Uncertainty and Gaps When the elements and links in a model have been defined, it is likely that very few will have the exactness of simple elements. Many will have wide limits to their probable values, either through a lack of knowledge or because they do really vary in space and time [102–106]. If the average value of each element is used as a basis for the simulation, then the model will produce only a single, apparently exact, result of the consequences of an environmental change.

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