Trump’s EPA move most likely refers to the scientific research arm : the agency’s Office of Research and Development, which NPR reported the Trump administration shut down in 2025. That office studied risks from toxic chemicals, climate change, air pollution, wildfires, and water contamination.

There’s also a separate, bigger EPA action in 2026: the administration ended the EPA’s greenhouse gas endangerment finding , which had been the legal basis for regulating climate pollution from cars, power plants, and oil and gas operations.

What was shut down

  • Office of Research and Development : EPA’s main scientific research division.
  • Climate regulation authority : the endangerment finding that supported greenhouse-gas rules.

Why this matters

The research office helped the EPA make evidence-based rules, so closing it weakens the agency’s ability to study environmental risks.

Ending the endangerment finding goes further, because it strips away the legal foundation for many federal climate rules unless courts or Congress change the outcome.

Likely source of confusion

People often mix up shutting down an office with rolling back a rule. In this case, both happened at different times: one was an EPA science-office shutdown, and the other was a major climate deregulation move.

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