The Union of Concerned Scientists (UCS) has been engaged in a sustained legal and advocacy effort challenging what it characterizes as anti-science actions by the Trump administration, and continuing under subsequent administrations. This work, spanning over 50 years, centers on promoting science-based solutions to protect people and the planet, with a particular focus on areas like clean energy, climate change, and democratic processes. The organization’s approach involves direct legal challenges, research, and advocacy at both the state and federal levels, aiming to restore the role of science in policymaking. The ongoing legal battles highlight a broader struggle to ensure that evidence and facts remain central to government decision-making.
For decades, the UCS has positioned itself as a leading independent science advocacy organization. The current wave of legal action began in response to perceived attempts to undermine established regulations and scientific findings. The organization asserts that administrations—regardless of party—will be held accountable for actions that violate laws or the Constitution. This commitment is demonstrated through a series of lawsuits targeting policies related to environmental protection and public health. The core of the UCS’s strategy is to leverage the courts to defend key policies and challenge actions that disregard scientific consensus.
Legal Victories and Ongoing Cases
A significant victory for the UCS came in August 2025, with the termination of a case, EDF et al v. Wright, after a judge sided with the UCS and the Environmental Defense Fund. The case challenged the Trump administration’s reliance on a climate skeptic group to produce a report intended to dismantle the “endangerment finding”—a crucial legal determination that greenhouse gas emissions endanger public health and welfare. The UCS details this success as a key moment in defending established environmental regulations.
Still, the fight continues. In February 2026, the UCS joined the American Public Health Association and 15 other organizations in filing a lawsuit, APHA et al v. EPA, against Lee Zeldin and the Environmental Protection Agency (EPA). This lawsuit alleges that the repeal of the endangerment finding was unlawful. According to the UCS, this case is currently progressing through the courts. The stakes are high, as the endangerment finding is foundational to the EPA’s authority to regulate greenhouse gas emissions.
Protecting Key Policies: A Four-Pronged Strategy
The UCS outlines four main legal strategies in its efforts to counter what it views as anti-science actions. The first, and currently most visible, is the protection of key policies. This involves challenging attempts to repeal or weaken existing regulations designed to protect public health and the environment. The EDF et al v. Wright and APHA et al v. EPA cases exemplify this strategy. The UCS is as well engaged in efforts to protect against censorship and disinformation, recognizing these as threats to evidence-based policymaking.
The organization’s broader advocacy extends beyond the courtroom. It actively works to connect experts, conduct research, and ensure that scientific evidence is accessible to policymakers. This includes campaigns at both the state and federal levels, addressing issues ranging from clean energy to transportation and food systems. The UCS believes that a multi-faceted approach—combining legal action with public education and advocacy—is essential to safeguarding the role of science in government.
The Broader Context: Science Under Pressure
The UCS’s actions are part of a larger trend of increasing challenges to scientific integrity in policymaking. The organization points to instances of censorship, disinformation, and the undermining of scientific consensus as threats to progress on critical issues. This concern is not limited to the federal government; the UCS is also involved in advocacy efforts at the state level, addressing similar challenges in various jurisdictions. The organization’s work reflects a growing recognition of the importance of defending science as a vital public good.
The legal battles waged by the UCS are not simply about defending specific regulations; they are about upholding the principle that policy decisions should be informed by the best available evidence. The organization argues that this principle is essential for addressing complex challenges like climate change, public health crises, and ensuring a sustainable future. The UCS’s commitment to science-based solutions is rooted in a belief that facts and evidence still matter, especially in a political climate often characterized by polarization and misinformation.
The next key development in the APHA et al v. EPA case will be closely watched by environmental advocates and legal experts. As the case moves through the courts, it will likely shape the future of environmental regulation and the role of science in policymaking. The UCS continues to advocate for a renewed commitment to evidence-based decision-making at all levels of government.
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