Today's Talk Back guest argues that humankind is suffering from an insatiable need for growth. Documentary filmmaker Dave Gardner isn't afraid to take on a variety of touchy subjects and says we're attached to "superstitions and addictions" that we need to leave behind in order to have a sustainable society.

Gardner promises to challenge the assumptions of "economists, developers, the Pope, politicians, octomoms, wealthy capitalists, environmentalists, people who leave the lights on, and well . . . pretty much anybody." What do you think? Is Gardner right? Gardner will be with Peter and Jon on the Talk Back show Thursday July 19th. Tell us what you think.