According to Bishop Kate, they’ve become too well educated and eco-sensitive to reproduce. They do plan to leave the earth in good shape for other species to enjoy. The flaw in their plan is that most of the world’s women haven’t sign on, and it’s not even clear who the eco-stewards will be when the Episcopalians and similar purist groups are gone. (This is one of Mark Steyn’s more entertaining demographics-is-destiny columns.)