- Trump administration orders U.S. scientists to halt work on a key global climate report.
- NASA’s chief scientist Kate Calvin barred from attending IPCC climate discussions.
- The U.S. withdrawal raises concerns about the future of international climate research.
The Trump administration has ordered U.S. government scientists to halt their contributions to a critical global climate report, according to a scientist involved in the project.
The move marks another step in the administration’s efforts to disengage the U.S. from international climate action and research.
The United States had played a significant role in preparing the next installment of the Intergovernmental Panel on Climate Change (IPCC) report, scheduled for release in 2029.
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The IPCC, the world’s leading climate science authority, assesses the impact of the climate crisis based on the latest research. Its reports, compiled by thousands of scientists over several years, serve as a vital resource for policymakers worldwide.
Since its first publication in 1990, the IPCC has been the foundation of globally accepted knowledge on climate change. The U.S. decision to halt participation raises concerns about the future of international collaboration on climate science.
An upcoming IPCC authors’ meeting, originally set to take place in China next week, now faces uncertainty. Kate Calvin, NASA’s chief scientist and senior climate advisor, was slated to co-chair the discussions but has been affected by the stop-work order.

“Dr. Calvin will not be travelling to this meeting,” a NASA spokesperson confirmed. NASA also declined a media request for an interview with Calvin.
The person involved in the report reporters they were “not sure what this means for the planned work going forward, or if US scientists will participate in the writing of the IPCC reports.”
“The IPCC is the backbone of global climate science, providing the world with unbiased, evidence-based insights needed to confront the climate crisis,” said Harjeet Singh, a climate advocate and founding director of Satat Sampada Climate Foundation.
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“The decision to exclude US scientists significantly undermines this collaborative effort and risks compromising the process at a time when robust climate action is needed more than ever,” he said in a statement.
On his first day in office this year, President Donald Trump pulled the US out of the Paris Agreement, a landmark international climate change treaty in which nearly 200 countries agreed to work together to limit global warming. It’s a repeat of an action Trump took in his first term.





