4 s 3 Agencies should develop a Recommendation +1; list of the full range of impacts likely to be involved in the typical types of actions This will require a listing they undertake. both of typical agency actions affecting the environment, seé, e.g., Forest Service NEPA procedures, 36 Fed. Reg. 23670 (1971), as ated, potential impacts, of well as a list ofrel see, @.9., Water Resources Council "Proposed principles ...," 36 Fed. Reg. 24159-62 (1971). This description of potential impacts will help guide officials responsible for preparation of impact statements by ensuring that critical impacts are not overlooked and by making possible earlier, more accurate identification of "major," environmentally "significant" :actions: ~ Ht wo ot + tee ~ “Dutyto “palance*:advaiitages? and-Disadvantates of the Proposed Action. ; Inherent in the duty imposed on any agency by NEPA to promote environmental quality is the obligation to weigh the possible environmental effects of a proposal against the effects on other public - Values theagency is mandated to consider. -_If the | emvironmental effects are adverse, the agency must consider whether they outweigh the benefits of the proposal in deciding whether to go ahead. This implicit requirement is confirmed by the directive of Section 102(2)(B) that agencies develop methods for giving "presently unquantified environmental amenities and values ... appropriate consideration in decisionmaking along with economic and technical considerations."