Which statement best defines a significant impact?

• A. A minor effect on aesthetics.
• B. A short-term change in traffic.
• C. A notable risk assessment finding.
• D. A change in environmental patterns and processes due to project activities that is distinct from an undisturbed situation.

Answer: (D)

Significance in environmental impact assessment looks at whether project-related changes to the environment represent a meaningful departure from what would occur without the project. The best statement captures this by describing a change in environmental patterns and processes caused by project activities that is distinct from the undisturbed situation. In other words, a significant impact is a real, observable deviation in how ecosystems or environments function because of the project, not just minor or temporary shifts. A minor effect on aesthetics is typically too small to be considered significant; a short-term change in traffic may or may not be significant depending on scale and context; a notable risk assessment finding relates to potential risks rather than actual environmental changes themselves.