On October 1, 2014, the Environmental Law Institute held its annual U.S. Supreme Court update for the 2014 term, again featuring the leading experts in the country. ELI President John Cruden led a discussion with two of the most distinguished environmental law school professors in the nation to review the important Clean Air Act cases decided this year, and forecast their implications for future rulemaking, particularly in the greenhouse gas arena. This dialogue presents a transcript of the event, which has been edited for style, clarity, and space considerations.