In an article exploring the philosophical issues raised by environmentalism, Ben Rogers argues for an alternative both to the narrowly economic and to an extravagantly mystical concept of Nature. Species and ecosystems, mountain ranges and mineral reserves have an intrinsic value in the sense that Nature moves and disturbs us independently of our concern for our own welfare or happiness. This analysis enables us to see the inadequacy of cost-benefit analysis, which treats natural goods as commodities. At the same time, recognizing that the natural environment has an intrinsic value does not in itself release us from the necessity of making difficult choices or from hard decisions as to what is and what is not 'natural'. One way of clarifying the place that Nature occupies in our scheme of values is by way of analogies with heirlooms, works of art and historic towns and cities. These analogies shed light on what it means to insist that natural goods are not commodities, but are something we hold in trust.