Do the Math Online

Lester Brown - Self, Mike Brune - Self (Sierra Club), Majora Carter - Self, Susan Casey-Lefkowitz - Self, Richard Cizik - Self, James Hansen - Self (Goddard Institute), Van Jones - Self, Robert F. Kennedy Jr. - Self (archive footage) (as Robert Kennedy Jr.) , Naomi Klein - Self, Sophie Lasoff - Self, Nelson Mandela - Self (archive footage) , Bill McKibben - Self, Stephen Mulkey - Self, Phil Radford - Self, Juliet Schor - Self