"Our politics and science have never mastered the fact that people need more than to understand their obligation to one another and to the earth; they need also the feeling of such obligation, and the feeling can come only within the patterns of familiarity. A nation of urban nomads, such as we have become, may simply be unable to be enough disturbed by its destruction of the ecological health of the land, because the people's dependence on the land, though it has been expounded to them over and over again in general terms, is not immediate to their feelings."