What is cumulative effects assessment (CEA)?

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Cumulative effects assessment looks at how the environmental impacts of several actions add up over time and across space. It asks what the total pressure on ecosystems, habitats, water quality, air, and other components is when multiple projects, land uses, or policies occur in the same area. It considers how effects accumulate, how actions overlap in time, and how different stressors interact or amplify one another, including indirect or lagged responses. It also uses a baseline and looks at how the environment may respond to a suite of actions, not just a single change, to determine whether the combined effects may exceed acceptable limits and what mitigation or monitoring might be needed. This is different from focusing on a single project’s effects in isolation, from financial analysis of profits and costs, or from a risk register that tracks hazard probability.