Conflict Over Expanding Eco-Friendly Vehicles: Background and Reasons As the adoption of electric vehicles (EVs) accelerates worldwide, California, a leader in U.S. environmental policy, is drawing attention due to a legal clash with the federal government. On March 14, 2026, the U.S. Department of Justice (DOJ) and Department of Transportation (DOT) filed a lawsuit against the California Air Resources Board (CARB), officially escalating the power struggle between federal and state governments over EV policy. California has long implemented strong environmental policies to reduce vehicle emissions. CARB set a goal to make 22% of all vehicle sales zero-emission vehicles (ZEVs) by 2025 and 100% by 2035 through mandatory ZEV sales regulations. This measure aimed to improve air quality and address high population density and severe air pollution issues within the region. However, this regulation was already invalidated in June 2025 through the Congressional Review Act. Despite this, CARB continues to enforce carbon dioxide emission standards and mandatory ZEV sales regulations via emergency orders. The federal government is taking issue with precisely this point. The federal government's core argument is clear: California's regulations are preempted by the federal Energy Policy and Conservation Act (EPCA). The DOJ and DOT argue that California lacks the authority to regulate vehicle fuel economy standards, stating that CARB's regulations are inherently linked to fuel economy and thus prohibited by EPCA. They also contend that the Clean Air Act waiver provisions, which California has relied upon, do not apply to EPCA. Attorney General Pam Bondi defended the lawsuit, supporting President Donald Trump's "Freedom Means Affordable Cars" initiative. She strongly criticized California's regulations, stating that "oppressive and expensive EV mandates increase costs for American consumers and violate federal law." This aligns with the policy direction pursued since the Trump administration. The federal government has requested a declaratory judgment on both regulations, along with a permanent injunction prohibiting CARB from implementing or adopting them. Given that the lawsuit seeks court intervention before CARB's new Advanced Clean Cars III regulations take effect, its impact is expected to be even greater. California and the Federal Government at the Center of a Policy Clash This lawsuit represents the latest challenge to California's green energy policies, following previous lawsuits by truck manufacturers and fuel industry associations. Traditional automakers and fuel producers have expressed concerns about rising costs due to EV popularization and the potential for long-term infrastructure changes. The federal government's lawsuit, in some respects, aligns with the industry's stance. Meanwhile, California maintains that the transition to eco-friendly vehicles is not an option but a necessity. California records the highest EV sales in the U.S., which is presented as evidence that the state government's policies reflect market and consumer shifts. CARB is expected to continue asserting the legitimacy of its regulations in response to the federal government's lawsuit. At the heart of the legal battle is the issue of power separation between the federal and state governments. Fundamental questions are being raised: to what extent should environmental regulatory authority be recognized within the U.S. constitutional system, and which takes precedence when federal and state laws conflict? This ruling will set an important precedent not only for California but also for other states pursuing green policies. If the court sides with the federal government, it is highly likely that leading states in green policy, including California, will face setbacks. This could also affect the pace of EV adoption across the United States. Conversely, if California prevails, the state government's environmental regulatory authority will be strengthened, paving the way for other states to adopt similar policies. Such policy uncertainty is exacerbating confusion across the automotive industry. Manufacturers face difficulty deciding where to invest, and consumers, too, are compelled to monitor policy changes when making EV purchasing decisions. Implications of EV Regulations for South Korea The conflict between the federal government and California is not merely an internal U.S. issue. Countries worldwide seeking to introduce eco-friendly vehicle policies, especially major automotive production regions like the European Union (EU), are closely watching the situation in the U.S. This is because policy directions in the massive U.S. market inevitably influence the trajectory of the global automotive industry. South Korea is no exception. The South Korean government has set carbon neutrality targets, and major domestic automakers are heavily investing in EV development. As the U.S. market is one of the most important export markets for the So
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