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On April 15, 2026, the NAM filed an amicus brief in the Commonwealth Court of Pennsylvania arguing that harms allegedly caused by global climate change cannot arise under state law. In this iteration of the nationwide litigation campaign to monetize climate change, Bucks County, Pennsylvania sued 14 energy manufacturers under the state’s public nuisance and consumer protection laws alleging damages caused by interstate emissions of greenhouse gases. Over the past decade, more than three dozen lawsuits have been filed against oil and gas companies in state courts around the country, alleging countless violations of state statutes and common laws. Our amicus brief explains that climate change is a complex policy matter that is inherently national in nature. Individual states cannot regulate interstate and international emissions of greenhouse gases, which require uniform federal governance and international collaboration.