One degree turns out to be enough to really unhinge all sorts of earth's ecosystems.

If [a student's] college’s endowment portfolio has fossil-fuel stock, then their educations are being subsidized by investments that guarantee they won’t have much of a planet on which to make use of their degree.

A world where one tenth of the population gets to be extremely wealthy, and six tenths very poor, is not, in the long run, a stable place.

Climate change is a huge problem, an almost insoluble problem.

A voluntary simplification of life-styles is not beyond our abilities, but it is probably outside our desires.

The end of nature sours all my material pleasures. The prospect of living in a genetically engineered world sickens me. And yet it is toward such a world that our belief in endless material advancement hurries us. As long as that desire drives us, here is no way to set limits.

By themselves, they are not enough; we also need to engage in political action.