; or (B) there is a significant new circumstance or information relevant to environmental concerns that bears on the proposed action or the environmental impacts of the proposed action. (3) Length of environmental document (A) In general Except as provided in subparagraph (B), an environmental impact statement shall not exceed 150 pages, not including any citations or appendices. (B) Extraordinary complexity An environmental impact statement for a proposed agency action of extraordinary complexity shall not exceed 300 pages, not including any citations or appendices. (p) Integration of planning and environmental review (1) In general Subject to paragraph (5) and to the maximum extent practicable and appropriate, the following agencies may adopt or incorporate by reference, and use a planning product in proceedings relating to, any class of action in the environmental review process of a project described or designated under subsection (b): (A) The lead agency for a project, with respect to an environmental impact statement, environmental assessment, categorical exclusion, or other document prepared under the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. ). (B) A cooperating agency with responsibility under Federal law with respect to the process for and completion of any environmental permit, approval, review, or study required for a project under any Federal law other than the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq. ), if consistent with such Act. (2) Identification If a lead or cooperating agency makes a determination to adopt or incorporate by reference and use a planning product under paragraph (1), such agency shall identify the agencies that participated in the development of the planning products. (3) Adoption or incorporation by reference of planning products Such agency may— (A) adopt or incorporate by reference an entire planning product under paragraph (1)