As we approach, and prepare for, the Johannesburg Summit—Rio plus 10—we need all the wisdom we can muster if the human family is to move, beyond the faltering steps of Rio ‘92, into genuine sustainable living on the earth. Anything less than genuine sustainability, considering our present population, consumption, and technology, will spell catastrophes within this century. The Earth Charter, an interfaith declaration of principles, says ‘Every individual, family, organisation, and community has a vital role to play. The arts, sciences, religions, educational institutions, media, businesses, non-governmental organisations, and governments are all called to offer creative leadership.’ The Earth Charter identifies no one religion, nor religion itself, as the global ‘mother church’, or pre-eminent pillar of earth ethics. Significantly, however, several important contributors to the Charter are Christian. One, Steven Rockefeller, observes, ‘Many of the critical concerns and spiritual ideals affirmed in the document resonate with values that have traditionally been important to Christians.’ The Christian religion has a cosmic dimension, for in Jesus incarnate, God unites himself with all humanity, and therefore with the whole earth community. Rockefeller argues that social ethics extends to the whole earth community. More strikingly still, an American astronaut, and Christian, James Irwin, says, ‘It is more important that Christ walked upon the earth, than that man walked upon the moon.’