; and (ii) have a proximate causal relationship to the proposed agency action or an alternative, as applicable. (B) Requirement For purposes of subparagraph (A)(ii), a but for causal relationship is insufficient to establish a proximate causal relationship. (7) Environmental assessment The term environmental assessment means a concise public document prepared by a Federal agency to determine whether to prepare an environmental impact statement or a finding of no significant impact for a proposed agency action. (8) Environmental document The term environmental document includes an environmental assessment, a finding of no significant impact, a notice of intent, and an environmental impact statement. (9) Environmental impact statement The term environmental impact statement means a detailed statement required to be prepared for a major Federal action significantly affecting the quality of the human environment in accordance with title I. (10) Environmental review The term environmental review means the process of preparing, for a proposed agency action in accordance with this Act, an environmental impact statement, an environmental assessment, a categorical exclusion, a finding of no significant impact, or a record of decision. (11) Federal agency The term Federal agency has the meaning given the term agency in section 551 of title 5, United States Code. (12) Finding of no significant impact The term finding of no significant impact means a document prepared by a Federal agency briefly presenting the reasons why a proposed agency action, not subject to a categorical exclusion— (A) will not have a significant effect on the human environment; and (B) will not have an environmental impact statement prepared for the action. (13) Involved Federal agency The term involved Federal agency means a Federal agency that, with respect to a proposed agency action— (A) proposed the action