"Environmentalists should reduce their over-reliance on apocalyptic scenarios "that tend to create feelings of helplessness and isolation among would-be supporters," Shellenberger advises. "Martin Luther King Jr.'s 'I Have a Dream' speech is famous because it put forward an inspiring, positive vision that carried a critique of the current moment within it. Imagine how history would have turned out had King given an 'I Have a Nightmare' speech instead.” Indeed, the key to a revitalized environmental movement will be the application of a belief King often expressed: Warnings of impending catastrophe, along with shame, protests and lawsuits, all have a role to play, but any movement will fail if it cannot paint an intensely attractive vision of the future, one that appeals to the mind and to the spirit."

— Richard Louv, The Oregonian, March 28, 2005