Unformatted text preview: it operates at the physical limit of the food system because it cannot afford to save a surplus for lean years.
During a lean year the food supply system cannot keep pace with demand. The overshoot of the system is the
amount that demand exceeds supply. As the degree of overshoot (the gap between supply and demand)
increases, the risk of starvation increases. Thus, we can increase food security by using the food supply system
sustainably, i.e., by maintaining a demand on renewable systems that is less than the maximum rate of
replenishment. Economic sustainability works the same way: if you save economic capital (money) at a greater
rate than you spend it, supply is greater than demand, and you accumulate a surplus in your bank account.
However, if you spend money faster than you earn it, you are in overshoot, and you will eventually deplete your
stock of money. 10 1/20/2011 Chapter One: Principles
To recap, sustainability is a process in which society preserves and grows social, economic, and
environmental capital by ensuring that the supply of each form of capital is greater than demand. This
increases security and ensures that future generations will be able to meet their needs. Renewable and Nonrenewable Resources and the Laws of Sustainability A main message of this bo...
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- Fall '14
- John C. Ayers