David Holmgren, co-originator with Bill Mollison of the Permaculture concept, is an innovative environmental design consultant based at Hepburn Springs in central Victoria, where he maintains one of Australia's best-known permaculture demonstration sites. David has written several books, conducted numerous workshops and courses on sustainable living, and developed several properties himself using permaculture principles. The following feature is adapted from a public lecture given at the Aldinga Arts EcoVillage in Adelaide in January 2005. You can check David's website: http://www.holmgren.com.au.