Supreme Court Closes Door on Global Warming Suits Based on Federal Common Law
Reversing the Second Circuit, the Supreme Court on June 20, 2011 held, in American Electric Power Company v. Connecticut, that the Clean Air Act, along with EPA regulatory action that it authorizes, displaces any federal common-law right to seek abatement of emissions of greenhouse gases (GHGs) from power plants. The Court’s decision means that for the foreseeable future, the debate over the proper scope of federal GHG regulation will take place in the executive and legislative branches and not the courts. It also leaves unanswered the question whether traditional state common-law remedies still have a role to play in GHG regulation.
The case began as two separate lawsuits filed in the Southern District of New York by eight States and the City of New York, and by three nonprofit groups, against five power companies that, according to the complaints, are the five largest emitters of carbon dioxide in the country. The plaintiffs sought injunctive relief in the form of orders to cap and reduce the emissions, invoking both the federal common law of interstate nuisance and state common law. The district court dismissed both actions as presenting non-justiciable political questions, but the Second Circuit reversed. The appellate panel (which included then-Circuit Judge Sonia Sotomayor) held that the suits were not barred by the political question doctrine, that the plaintiffs had standing to bring their claims, and that the Clean Air Act did not displace federal common law. Recognized that EPA has the authority under the Clean Air Act to regulate carbon dioxide as an air pollutant, and the principle that federal common law is displaced when Congress has spoken directly to a particular issue, the appellate court held that at least until EPA takes some specific regulatory action -- beyond its then proposed (but not final) finding that greenhouse gases endanger public health and welfare, the statute does not regulate greenhouse gas emissions, or does not regulate such emissions from stationary sources. Subsequent to the appellate decision, in December 2009, EPA issued its final GHG Endangerment Finding, identifying six GHGs in the atmosphere to be a threat to public health and welfare of current and future generations. Although the Endangerment Finding does not impose any requirements on industry, it is a prerequisite to such regulation.
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