; or (B) the lead agency approves a longer statement in writing and establishes a new word limit. (b) Environmental assessments (1) Sponsor preparation A lead agency may allow a project sponsor to prepare an environmental assessment, if such agency provides such sponsor with appropriate guidance and assists in the preparation. The lead agency shall independently evaluate the environmental assessment before adopting it, and shall take responsibility for the contents upon adoption. (2) Word limit An environmental assessment may not exceed 37,500 words, excluding appendices, unless the lead agency approves a longer statement in writing and establishes a new word limit. (3) Deadline Environmental assessments required by section 102 shall be completed not later than 1 year after the date on which the decision to prepare such environmental assessment is made unless the lead agency approves a delay in writing and establishes a new timeline that provides only so much additional time as is necessary to complete such environmental assessment. (c) Review for application of section 102 In reviewing a Federal action to determine the appropriate review under section 102: (1) Requirements for a cooperating agency A cooperating agency shall submit any comments within a time period specified by the lead agency and limit such comments to matters on which such agency has jurisdiction by law or special expertise with respect to an environmental issue. (2) Definition of significance In determining whether the effects of a proposed Federal action are significant, a Federal official shall only consider the reasonably foreseeable effects with a reasonably close causal relationship to the action being considered and may not consider cumulative effects. (d) Categorical exclusions Not later than 90 days after the date of enactment of this section, the Council on Environmental Quality shall establish procedures for a Federal agency to adopt a categorical exclusion established by another Federal agency. (e) Judicial review No agency action