The radicals were at another event, far outside the well-guarded hangar walls of the Le Bourget airport complex. With them were moderates, labor leaders, community advocates, progressive politicians, and a guy in a flannel shirt who described himself during the question-and-answer session as a “possibilitator.” Like the OECD and its partners, the group at the Salle Olympe de Gouges, a multipurpose theater less than a mile from the site of two of the November 13 suicide bombings, called for total transformation to stop climate change from wiping out much of the habitable world.