What can one motivated person do? Just ask Lee Harvey Oswald.
This book is a classic, well-written soup-to-nuts basic guide to sustainability. From gardening, to soil care, to animal husbandry, to the slaughter and butchery of livestock, you learn the basics of growing, canning, and preserving food crops along with the best ways to dress game and livestock. There's humor in here, great illustrations, and it makes an excellent coffee table book that's sure to spark some good discussions. Nothing is comprehensive, but this book is a great start.
While not everyone will get to live on a farm in the country, the skills here can be passed around and split up in inner-city neighborhoods and suburbs. This is what your great-grandparents knew and everyone since has forgotten. -- MCR