In today's culture of insatiable freedom, many believe that to be human is to be an insatiable self-actualizer. Yet insatiable is not sustainable. In order to solve today's crisis of environmental sustainability--and human sustainability--we must let go of our obsession to constantly be more. The desire to have all that we can have comes, Brown argues, from a cultural norm that has evolved to become an economic, social, and moral imperative-that To Be is to achieve more, improve more, and insatiably have more, to the point of planetary extinction.

Incorporating the views of classic...