Automatically trigger other actions which may require environmental impact statements. Cannot or will not proceed unless other actions are taken previously or simultaneously. Are interdependent parts of a larger action and depend on the larger action for their justification. An agency may wish to analyze these actions in the same impact statement. It should do so when the best way to assess adequately the combined impacts of similar actions or reasonable alternatives to such actions is to treat them in a single impact statement.
Significance varies with the setting of the proposed action.
For instance, in the case of a site-specific action, significance would usually depend upon the effects in the locale rather than in the world as a whole. This refers to the severity of impact. Responsible officials must bear in mind that more than one agency may make decisions about partial aspects of a major action. A significant effect may exist even if the Federal agency believes that on balance the effect will be beneficial. The degree to which the proposed action affects public health or safety.