How to be a Truly Sustainable Business : Ecopreneurist.
The principles for a sustainable business I get from this post are: (1) use the resources you have efficiently and do not overuse them (time, money, natural resources, employees); (2) diversify economic activities (core biz and related) to be less dependent on one activity or market; and (3) share business with others that are working in the same niche to build up a network you can fall back on in times of crises and to not overuse your resources.