That is, is NEPA only a procedural requirement imposing additional paperwork on agencies, or does it also impose substantive limits on agency decisions?

• 也就是说，《国家环境政策法》仅仅是强加给机构的额外程序要求，使机构多做一份文本工作，抑或是对机构的决定还施加一些实质性限制?