Case 19-1: Massachusetts V. EPA

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Case 19-1: Massachusetts v EPA Facts: A group of 19 private organizations filed a petition asking EPA to regulate “greenhouse gas emissions from new motor vehicles under the Clean Air Act. Petitioners maintained that greenhouse gas emissions have accelerated climate change and that carbon dioxide is the most important contributor to climate change. EPA denied the petition, claiming that the Clean Air Act does not authorize the Agency to regulate greenhouse gas emissions. Even if it did, EPA argued, the Agency had discretion to defer a decision until more research could be done on "the causes, extent and significance of climate change and the potential options for addressing it." Massachusetts, other states and private organizations filed suit

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