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Evaluating and Managing Cumulative Effects: Process and Constraints.

MacDonald1

  • 1Department of Earth Resources, Colorado State University, Fort Collins, Colorado 80523-1482, USA

Environmental Management
|September 8, 2000
PubMed
Summary
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Cumulative effects (CEs) assessments are challenging due to complex interactions and scale issues. A structured process, focusing on minimizing impacts and adaptive management, can improve evaluation and regulation of environmental CEs.

Area of Science:

  • Environmental Science
  • Ecology
  • Environmental Management

Background:

  • Cumulative effects (CEs) arise from combined activities over time and space, requiring broader environmental assessments beyond project-specific impacts.
  • Current CE evaluations face challenges in defining issues, setting scales, and understanding interactions and indirect effects.

Purpose of the Study:

  • To propose an explicit process for evaluating and managing cumulative effects (CEs).
  • To address the conceptual and practical difficulties in assessing and regulating CEs.

Main Methods:

  • A three-phase process: scoping, analysis, and planning/management, with discrete, interrelated tasks.
  • Review of various CE assessment approaches, from checklists to complex models, considering resource, risk, data, and time constraints.

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Main Results:

  • The proposed process can alleviate conceptual problems in CE assessment.
  • Assessment and regulation of CEs are hindered by site variability, indirect effects, data gaps, model validation issues, and future uncertainties.

Conclusions:

  • A tiered or nested approach is recommended for assessing CEs due to their scale and complexity.
  • Minimizing on-site impacts, adaptive management, and regular monitoring are critical for effective CE management and regulation.