Question of whether taxpayers or fossil fuel companies pay for climate change damage heads to Supreme Court

Climate change causes billions of dollars in damage annually from events like floods, fires, and droughts. For example, the U.S. National Centers for Environmental Information (NCEI) tracks these costs, which have risen significantly in recent years. Local governments—such as states, cities, counties, and tribes—are suing major oil companies like Exxon and Suncor, demanding reimbursement for recovery efforts, reconstruction, and protective measures against climate-related disasters. These lawsuits argue that fossil fuel companies knew their products contributed to climate change but hid this information from the public. Internal company scientists at Exxon and others had accurately predicted global temperature increases as early as the 1970s and warned that reducing fossil fuel use was necessary to avoid severe warming. Instead of informing the public, these companies funded groups that denied climate science and delayed transitions away from fossil fuels. The total costs borne by taxpayers and communities are substantial, with local governments spending millions on adaptation and recovery efforts.

The legal dispute centers on whether fossil fuel companies or taxpayers should pay for climate change damages. In 2018, Boulder County, Colorado, sued Suncor Energy and Exxon, seeking compensation for past and future costs tied to climate-related disasters like wildfires and flooding. The companies argue that federal law, specifically the Clean Air Act (a 1970 law regulating air pollution), prevents them from being held responsible under state law. In 2025, the Colorado Supreme Court ruled that the lawsuit is valid because it addresses public deception and local costs, not an attempt to regulate federal emissions. However, the U.S. Supreme Court agreed to hear arguments in Suncor Energy v. County Commissioners of Boulder County on October 5, 2026, to decide whether federal law blocks these lawsuits. The outcome could impact dozens of similar cases nationwide, with major financial implications for both communities and fossil fuel companies.

Preemption is a legal principle where federal law can override state law if Congress intended it. There are two types: express preemption, where federal law explicitly states it supersedes state law, and implied preemption, where state law conflicts with or obstructs federal objectives. For example, in Monsanto v. Durnell (2026), the Supreme Court ruled that federal pesticide law preempted a state law requiring warnings on harmful products. In the Suncor case, fossil fuel companies argue that the Clean Air Act preempts state lawsuits seeking compensation for climate damages. However, the Clean Air Act includes a provision stating it does not override state laws providing additional remedies for air pollution. The Supreme Court has previously acknowledged that states can seek compensation for climate impacts under state law, making the companies' preemption argument difficult to sustain.

Fossil fuel companies claim that states lack authority to address pollution from interstate or international sources unless Congress explicitly authorizes it. They also argue that lawsuits like Boulder County's interfere with the federal government's exclusive authority over foreign affairs. However, the 10th Amendment to the U.S. Constitution reserves powers not delegated to Congress to the states, allowing them to protect citizens from corporate misconduct. The Supreme Court has rarely recognized foreign policy preemption, such as in a 2000 case where it overturned a Massachusetts law barring state business with Burma after Congress passed a federal trade law. Extending this principle to air pollution would significantly expand federal preemption. Additionally, recent actions by the Trump administration complicate the companies' arguments by asserting that the Clean Air Act does not authorize regulation of greenhouse gas emissions, effectively undermining their preemption claims.