l89.
Lady Eve Balfour, “Towards a Sustainable Agriculture: The Living Soil”, paper given at a conference of the International Federation of Organic Agricultural Movements (IFOAM), 1977, p 7, reprinted in Andrew Dobson, ed. (1991), The Green Reader: Essays Toward a Sustainable Society. Also available at https://tinyurl.com/nnc9dyo (quotation slightly abridged).