Sustainable development is. . . Considering that the concept of sustainable development is now enshrined on the masthead of Environment magazine, featured on 8,720,000 Web pages,1 and enmeshed in the aspirations of countless programs, places, and institutions, it should be easy to complete the sentence.2 But the most widely accepted definition is creatively ambiguous: “Humanity has the ability to make development sustainable—to ensure that it meets the needs of the present without compromising the ability of future generations