The Environmental Protection Agency (EPA) has formally announced the repeal of the 2009 Endangerment Finding, a decision that removes the primary scientific and legal justification for the federal regulation of greenhouse gas emissions. This move has prompted immediate and widespread condemnation from environmental advocacy groups, scientific organizations, and stakeholders in the outdoor recreation industry. Protect Our Winters (POW), a prominent non-profit representing the "Outdoor State"—a constituency of 181 million outdoor enthusiasts—has responded by calling for the immediate resignation of EPA Administrator Lee Zeldin. The repeal represents a fundamental shift in the agency’s interpretation of the Clean Air Act, effectively decoupling public health protections from the mitigation of climate change-inducing pollutants such as carbon dioxide and methane.
The Endangerment Finding, established in December 2009, was the administrative response to the 2007 Supreme Court ruling in Massachusetts v. EPA, which determined that greenhouse gases are pollutants under the Clean Air Act. The finding concluded that the current and projected concentrations of six key greenhouse gases in the atmosphere threaten the public health and welfare of current and future generations. By repealing this finding, the EPA under Administrator Zeldin has signaled a departure from decades of established climate science, arguing instead for a narrower interpretation of the agency’s statutory authority that prioritizes industrial deregulation over atmospheric stabilization.
Historical Context and the Legal Evolution of the Endangerment Finding
To understand the magnitude of the current repeal, it is necessary to examine the legal framework that necessitates the Endangerment Finding. The process began in 1999 when a group of environmental organizations petitioned the EPA to regulate greenhouse gas emissions from new motor vehicles. After years of litigation, the U.S. Supreme Court ruled in 2007 that the EPA must determine whether these emissions contribute to air pollution that may reasonably be anticipated to endanger public health or welfare.
In 2009, following an exhaustive review of peer-reviewed science from the Intergovernmental Panel on Climate Change (IPCC) and the U.S. Global Change Research Program, the EPA issued two distinct findings. The "Endangerment Finding" stated that the atmospheric concentrations of greenhouse gases are the primary driver of climate change and pose a threat to human health through extreme weather events, changes in air quality, and the spread of infectious diseases. The "Cause or Contribute Finding" stated that emissions from motor vehicles contribute to this threat. Together, these findings formed the "scientific backbone" for nearly every federal climate regulation enacted over the last fifteen years, including fuel economy standards for vehicles and the Clean Power Plan for stationary sources.
The repeal of these findings in 2025 marks the first time in the agency’s history that a foundational scientific determination of this nature has been rescinded without a corresponding body of new, peer-reviewed evidence to contradict the original assessment.
Chronology of Regulatory Rollbacks Since January 2025
The repeal of the Endangerment Finding is viewed by analysts as the culmination of a broader effort to dismantle environmental protections since the transition of leadership at the EPA in early 2025. Since January, Administrator Zeldin has overseen a series of policy shifts aimed at reducing the regulatory burden on the fossil fuel industry.
In February 2025, the EPA moved to suspend the implementation of the Methane Emissions Reduction Program, which had sought to limit leaks from oil and gas infrastructure. This was followed in March by a proposal to revise the National Ambient Air Quality Standards (NAAQS), specifically targeting the relaxation of ozone and particulate matter limits. By April, the agency began the formal process of withdrawing the United States’ commitments to international methane reduction pledges, citing the need for "energy independence and domestic economic revitalization."
The decision to target the Endangerment Finding itself began in mid-2025, with the EPA internalizing a legal theory that greenhouse gases do not meet the criteria of "criteria pollutants" as defined by the original 1970 Clean Air Act. This interpretive shift allowed the agency to argue that it lacks the specific congressional mandate to regulate carbon emissions, thereby necessitating the repeal of the 2009 finding to align the agency’s scientific posture with its new legal strategy.
Scientific and Regional Impacts: The Rise of the "Snow Drought"
The EPA’s policy shift occurs against a backdrop of worsening climatic conditions, particularly in the American West. Protect Our Winters and other climate monitors have highlighted a phenomenon known as "snow drought," where unusually warm winter temperatures cause precipitation to fall as rain rather than snow. This trend has reached critical levels in the 2024–2025 winter season.
Scientific measurements and satellite data from the National Resources Conservation Service (NRCS) indicate that snowpack levels across the Sierra Nevada, the Cascades, and the Southern Rockies are currently at 40% to 60% of their historical averages for this time of year. The loss of mountain snowpack is more than a recreational concern; it is a hydrological crisis. In the Western United States, snowpack acts as a "natural reservoir," storing water during the winter and releasing it slowly during the spring and summer months to feed rivers, sustain agriculture, and provide drinking water to millions.
When precipitation falls as rain in mid-winter, it results in immediate runoff, which can lead to flooding and the premature depletion of water reserves. This leaves less water available for the late-summer dry season, exacerbating wildfire risks. According to the National Interagency Fire Center, the lack of a sustained, deep snowpack is a primary predictor of early-onset fire seasons. The EPA’s decision to repeal the Endangerment Finding effectively ignores these direct correlations between carbon emissions, atmospheric warming, and the destabilization of regional water cycles.
Economic Implications for the "Outdoor State"
The economic impact of the EPA’s decision is significant, particularly for the outdoor recreation sector. Often referred to as the "Outdoor State," the 181 million Americans who participate in outdoor activities contribute to a $1.2 trillion annual economic output. This sector supports approximately 5 million jobs across the United States, ranging from hospitality and retail to manufacturing and professional guiding.
According to data from the Bureau of Economic Analysis (BEA), outdoor recreation accounts for roughly 2.2% of the total U.S. Gross Domestic Product (GDP). The stability of this economy is intrinsically linked to predictable seasonal patterns and the health of public lands. In states like Colorado, Utah, and Montana, winter tourism is a cornerstone of the regional economy. A persistent "snow drought" threatens the viability of ski resorts, winter sports equipment manufacturers, and the thousands of small businesses that rely on seasonal tourism.
Furthermore, the repeal of environmental protections has broader implications for Tribal nations and rural communities. Many Tribal nations rely on stable water supplies for traditional fishing and agricultural practices. The degradation of water quality and the reduction in stream flows—consequences of both climate change and the loosening of industrial pollution standards—threaten the treaty rights and cultural heritage of these communities.
Reactions from Stakeholders and Policy Experts
The reaction to Administrator Zeldin’s leadership and the repeal of the Endangerment Finding has been sharply divided. While fossil fuel trade associations have praised the move as a return to "regulatory certainty" and "constitutional adherence," the scientific community and environmental advocates have expressed alarm.
"The EPA is legally obligated to protect human health based on the best available science," stated a joint release from several leading climate advocacy groups. "By repealing the Endangerment Finding, the agency is not just ignoring science; it is actively working against its own mission. This is an abdication of responsibility that will have generational consequences."
Within the political sphere, the move is expected to trigger a massive wave of litigation. State Attorneys General from at least 20 states have already signaled their intent to file suit against the EPA, arguing that the repeal is "arbitrary and capricious" under the Administrative Procedure Act. Legal experts suggest that because the 2009 finding was based on thousands of peer-reviewed studies, the EPA will face a high burden of proof in court to justify why that science is no longer valid.
Protect Our Winters’ call for Lee Zeldin’s resignation reflects a growing sentiment among stakeholders that the current EPA leadership is fundamentally at odds with the agency’s founding principles. "An EPA that ignores science and dismantles the tools designed to protect public health and the environment cannot fulfill its mission," the organization noted in its official statement.
Broader Implications and the Future of Federal Climate Policy
The repeal of the Endangerment Finding has profound implications for the future of U.S. climate policy and international standing. Domestically, it creates a "regulatory vacuum" where federal agencies no longer have a unified scientific basis for considering climate impacts in their decision-making processes. This could affect everything from environmental impact statements for new infrastructure projects to the evaluation of public health risks in urban areas.
Internationally, the move signals a retreat from global climate leadership. As the world’s second-largest emitter of greenhouse gases, the United States’ administrative decisions carry significant weight in global climate negotiations. The repeal may undermine international agreements, such as the Paris Accord, by suggesting that the U.S. government no longer recognizes the scientific necessity of limiting global temperature increases.
As the legal battles begin, the focus remains on the immediate environmental realities. The "snow drought" in the West serves as a reminder that the impacts recognized by the 2009 Endangerment Finding are not theoretical projections but lived experiences for millions of Americans. Whether through the courts or through public pressure and leadership changes, the resolution of this conflict will define the trajectory of American environmental protection for the coming decade. The call for Administrator Zeldin’s resignation is a clear indicator that for the 181 million members of the Outdoor State, the current direction of the EPA is viewed not as a policy shift, but as an existential threat.
