On April, 27, 2006, several US states, cities and environmental groups filed a lawsuit against the US Environmental Protection Agency (EPA) in the US Court of Appeals for the District of Columbia Circuit claiming the EPA had violated the federal Clean Air Act by failing to regulate carbon dioxide pollution from new power plants. The parties claimed the EPA's failures exacerbate the problem of global warming. The suit came in response to a 2005 DC Circuit ruling in which the court held that under the Clean Air Act the EPA did not have to regulate automobile carbon dioxide emissions. It also followed a March 2006 ruling by the same court that the EPA cannot exempt coal-fired power plants, oil refineries and other older industrial facilities from a requirement to install new pollution controls to keep up with emissions changes.
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