No one has ever denied that the Clean Air Act (CAA) is ill-suited for regulating greenhouse gases (GHGs). The purpose of the CAA, not surprisingly, is to ensure that the air is clean to breathe. The centerpiece of the Act is the National Ambient Air Quality Standards (NAAQS) program, under which the EPA defines safe ambient air concentrations of the most ubiquitous air pollutants and states are required to adopt plans to ensure those standards are met. The Act also requires stationary and mobile sources across the economy to limit emissions of all pollutants that endanger the public health or welfare.
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