Unformatted text preview: expresses the difference between inflows (S, supply) and
outflows (D, demand); we can maintain a steady state when the two are equal. The difference between the
global biocapacity (S) and global ecological footprint (demand D) is currently -1.5 global acres per capita, with
the negative sign again indicating that demand is greater than supply and that we have a global ecological
overshoot (Figure 9). For the U.S. the overshoot is -10.9 acres per capita (Hails 2008), which partly explains
why the U.S. has to import so many goods. Unfortunately, the footprint now exceeds the biocapacity, and the
gap between the two is increasing. In the unsustainable situation where demand is greater than supply, as it is
now, we build up an ecological debt. (Figure 10) adapted from (Hails 2008) illustrates an optimistic scenario
in which we act quickly to close the gap between supply and demand. The global biocapacity (supply) is one
planet earth. The global EF (demand) increases to ~1.3 planet earths in 2005, after which increasing use of
sustainable practices decreases the...
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This note was uploaded on 01/08/2014 for the course SUST 510 taught by Professor Marker during the Fall '14 term at Black Hills State University.
- Fall '14