Trump administration proposes reframing “worst-case” scenarios in 2023 National Climate Assessment

President Donald Trump’s administration has proposed changes to the way a key federal climate report describes its most severe “worst-case” scenarios, seeking to reframe the Fifth National Climate Assessment’s portrayal of high-impact risks that the report uses to show potential consequences of additional warming, according to The Hill. The Fifth National Climate Assessment, finalized in 2023, is the federal government’s assessment of climate science and impacts in the United States. In its latest round of input, the Trump administration is looking to alter how the assessment characterizes the outcomes it describes under the most extreme conditions, The Hill reported. The administration’s proposal comes amid international scientific scrutiny of the assessment framework. The Hill said the administration is attempting to respond to criticism earlier from United Nations scientists that raised concerns about how the assessment’s worst-case scenarios are defined and communicated. In the administration’s described approach, the focus is not on whether climate risks exist, but on how the report’s worst-case scenario language is framed, The Hill reported. The change is presented as an effort to adjust the assessment’s depiction of severity and uncertainty, rather than to remove climate discussion altogether. The practical effect of the proposed revisions would be to influence the federal government’s baseline language used by policymakers and agencies when climate information is cited in planning and regulation discussions. Because the National Climate Assessment is used as a reference point in multiple federal processes, changes to scenario framing can affect how agencies interpret the breadth and seriousness of climate-related risks, even when the underlying science is unchanged. The Hill also described the effort as part of a broader dispute over climate reporting standards and risk communication. Opposition to such changes, when they arise, often centers on whether altering scenario language blunts the urgency of warnings. The Hill’s account framed the administration’s move as a technical rewrite of how the “worst-case” elements are presented, tied to the administration’s assessment methodology concerns. A decision on whether the administration’s requested changes will be incorporated would follow the assessment’s review and update process, with the ultimate wording depending on how the assessment’s coordinating officials and scientific contributors handle the proposal and any accompanying responses.

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