The U.S. Chamber filed a motion to intervene in an environmental group's challenge of the EPA's interpretation of the Clean Air Act. In 2010, the EPA issued a revised memorandum interpreting the Clean Air Act to require the regulation of greenhouse gases from stationary sources under the PSD permitting program, but to delay the timing of the regulation of some of those sources (this was eventually superseded by the EPA's “Triggering Rule” and “Tailoring Rule.” In its motion to intervene, the U.S. Chamber said that EPA could not adequately represent the interests of the business community because the Center for Biological Diversity will likely argue that the new regulations do not go far enough. The revised EPA memorandum is just one part of the EPA's multi-faceted effort to regulate greenhouse gas emissions under the Clean Air Act.
