Core Viewpoint - The article discusses the impact of the Trump administration's policies on the flow of researchers in and out of the United States, indicating a trend of researchers leaving the U.S. and a decline in incoming talent, particularly in the fields of climate change and science [2][4][8]. Group 1: Researcher Mobility Trends - As of January to August 2025, the share of researchers leaving the U.S. reached 11%, an increase of 1.5 percentage points compared to the previous year, while the share of incoming researchers dropped to 15%, a decrease of 3.1 percentage points [4][6]. - The total number of cross-border changes in research affiliations globally was approximately 17,000, with about 2,000 researchers leaving the U.S. and 2,600 entering during the same period [4][6]. Group 2: Policy Impact - The policies of the Trump administration, including pressure on prestigious universities, budget cuts for science and technology, and restrictive immigration policies, are contributing to the exodus of researchers from the U.S. [2][8]. - The second Trump administration's policies are expected to have a more pronounced impact on researcher mobility after the fall of 2025, potentially marking a turning point in the trend of researchers coming to the U.S. [8]. Group 3: Global Competition for Talent - Other countries, particularly in Europe, are actively competing to attract talented researchers leaving the U.S. The European Commission plans to invest approximately €900 million from 2025 to 2027 to attract researchers from outside the EU [8]. - Japan has initiated a ¥100 billion emergency policy package aimed at attracting overseas research talent, with specific plans to invest ¥51 billion over three years to support universities [9].