I am unable to create a summary of the requested article because the search results provided do not include the content of the article entitled "Plan to break up iconic U.S. climate lab moves ahead" from the March 2026 Science magazine. The search results include information about the Science Summit 2026, an article from the Slovak journal Quark, and other articles related to climate and forests, but not the specific article you asked to summarize. In order to create an accurate and factual summary according to your requirements, I need to have the full text of this article available.