“Blessed Unrest” is not a glass-half-full book. But Hawken does imply that the movement — which he estimates at perhaps two million organizations strong — is a sign of life stirring in the beaten-up bowels of the planet, part of the earth’s own immunological response, as executed collectively (maybe even semiconsciously) by “social antibodies.” Hawken, studiously avoiding the language of religion, ends up groping for a faith-free yet faith-based terminology to describe what connects people who put aside their own immediate material needs, if just for a second. “Sustainability, ensuring the future of life on earth, is an infinite game, the endless expression of generosity on behalf of all,” he says. Hawken, it seems, is hoping for a miracle, which by definition is possible only because it’s impossible. At the very least, knowing that other people are thinking along those lines makes such a thing seem a little more likely.”