In a post this past February, I reported on the EPA’s regulation of greenhouse gases (GHGs) and the D.C. Circuit’s review thereof in the wake of Massachusetts v. EPA (2007). The appellate court has since upheld the EPA’s regulations in a per curiam opinion, issued by a panel that, amazingly, includes Judge Sentelle (Coalition for Responsible Regulation v. EPA, or “CRR”). The petitioners have asked for rehearing and/or rehearing en banc; the government has submitted a perfunctory reply (link no longer available). The petition will fail: the D.C. Circuit hardly ever convenes en banc, least of all on a per curiam panel opinion. But there is a decent chance that the petitioners may get a dissent from the denial, and therewith a shot at Supreme Court review. That may be the last chance to avert a regulatory train wreck of epic proportions.