In pondering the reasons for this lack of progress—this potentially cataclysmic failure of progressive argument—I have come to a fairly radical view: that we can never have a sustainable civilization unless we first achieve sustainability as individuals. Billions of us (not just a few million) will need to embrace lower-consumption, more thoughtful, more ecologically conscious lifestyles with the same personal passion that is today wasted on free-market profiteering, religious proselytizing, or yearning for power and control of other humans. And if I had to identify the single most daunting barrier to that kind of embrace, it is our pervasive intellectual and emotional disconnection from the living planet we evolved on.