The U.S. Supreme Court recently delivered a significant setback to California’s aggressive climate policies, with even one of the Court’s liberal justices siding with the conservative majority in a 7–2 decision. The ruling allows energy producers in California to proceed with their lawsuit against the U.S. Environmental Protection Agency (EPA), challenging the state’s strict green energy mandates.
At the center of the dispute is California’s requirement that electric vehicles (EVs) make up a dominant share of new car sales by 2035. This mandate is part of Governor Gavin Newsom’s broader plan to push the state toward what he calls “carbon neutrality.” Critics argue that such policies are overly forceful and could place heavy burdens on industries and consumers alike.
Writing for the majority, Justice Brett Kavanaugh emphasized that the government cannot impose strict and potentially unlawful regulations on an industry and then attempt to block that industry from challenging those rules in court. He stated that, based on legal precedent and the evidence presented, fuel producers have established the legal standing necessary to challenge the EPA’s approval of California’s regulations.
Kavanaugh also highlighted inconsistencies in the EPA’s legal stance over time, noting that the agency has repeatedly changed its interpretation of whether the Clean Air Act allows California to regulate greenhouse gas emissions from new vehicles. According to the Court, these shifting positions weakened the EPA’s argument.
This decision follows recent actions by President Donald Trump, who signed three resolutions aimed at rolling back key elements of California’s climate agenda. These moves represent a major challenge to Governor Newsom’s environmental initiatives and could have broader political implications, especially as Newsom is considered a potential presidential candidate in 2028.
The case itself traces back to California’s 2012 request for EPA approval of regulations requiring automakers to both limit average greenhouse gas emissions across their fleets and ensure that a certain percentage of vehicles sold are electric. These requirements have been a cornerstone of the state’s climate strategy.
Meanwhile, EPA Administrator Lee Zeldin has indicated that the Trump administration is preparing what it describes as the largest deregulation effort in U.S. history. A key part of this effort would involve reversing the EPA’s 2009 “Endangerment Finding,” which determined that greenhouse gases such as carbon dioxide pose a risk to public health and welfare.
If this finding is overturned, it would effectively halt more than a decade and a half of federal climate regulations that were built upon it. These rules have been estimated to carry costs exceeding one trillion dollars, according to critics.
The origins of this regulatory framework date back to the Obama administration. After Congress failed to pass comprehensive climate legislation, the EPA moved forward using the Clean Air Act as its legal basis for regulating greenhouse gases. However, opponents argue that the law—passed decades before climate change became a major policy issue—was never intended to address such emissions.
Originally, the Clean Air Act was designed to control specific pollutants that have immediate and direct impacts on human health, such as industrial smoke and vehicle exhaust. In contrast, greenhouse gases are produced by a wide range of everyday activities, from transportation to agriculture, and even natural processes like human respiration.
Critics maintain that applying the Clean Air Act to greenhouse gases has created legal uncertainty and led to years of ongoing court challenges. Despite this, the Biden administration relied on the Endangerment Finding to support policies aimed at rapidly increasing the adoption of electric vehicles, including goals that would make most new cars and trucks electric by 2032.
Supporters of these policies argue that they will save consumers money in the long run by reducing fuel costs. However, opponents counter that the government has not sufficiently justified the need for such mandates, especially given the high upfront costs associated with electric vehicles.
Many families, as well as workers in industries like trucking, have expressed concerns about affordability. The higher purchase price of EVs, often thousands of dollars more than traditional vehicles, presents a significant barrier for many Americans.
The Trump administration has argued that eliminating the Endangerment Finding and rolling back related regulations could reduce vehicle costs by nearly $2,500 per car. Supporters of deregulation see this as a necessary step to ease financial pressure on consumers and restore flexibility to the automotive market.
Overall, the Supreme Court’s decision marks an important moment in the ongoing legal and political battle over climate policy in the United States, with major implications for federal authority, state regulations, and the future of the energy and transportation sectors.
