GHG Regulation By US EPA Upheld

Can the US Environmental Protection Agency enforce its ambitious greenhouse gas emission rules under the Clean Air Act? Yes, according to the Endangerment Opinion of the District of Columbia US Court of Appeals:

"Following the Supreme Court's decision in Massachusetts v. EPA, 549 U.S. 497 (2007)"which clarified that greenhouse gases are an "air pollutant" subject to regulation under the Clean Air Act (CAA)"the Environmental Protection Agency promulgated a series of greenhouse gas-related rules.

First, EPA issued an Endangerment Finding, in which it determined that greenhouse gases may "reasonably be anticipated to endanger public health or welfare." See 42 U.S.C. § 7521(a)(1).