Following some research I am persuaded that permaculture practices can provide more food per land area and at substantially less cost and effort (win, win, win) than other farming or fruit & vegetable gardening practice.
'Permaculture - A Practical Guide for a Sustainable Future' by Bill Mollision, ISBN 1-55963-048-5, is an excellent book covering the philosophy behind permaculture, the concepts, methods, climate factors, water, soils, earth-working, aquaculture and strategies for humid, dry and temperate climates (and strategies for an alternative global nation).
A 50 minute BBC documentary 'Farm for the Future' on the prescient global farming and food crisis brings permaculture practices to life. Featuring Martin Crawford (Agroforestry Research Trust), Fordhall Farm, Richard Heinberg and others. Topics covered are the influence of oil on the food production, peak-oil, food security, carbon emissions, sustainability and permaculture. See
http://www.youtube.com/watch?v=xShCEKL-mQ8See also Practical Permaculture in Britain documentary by Malcolm Baldwin.
http://www.youtube.com/watch?v=nTyrd5aQ ... re=related