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Unformatted text preview: global EF until it becomes one earth in the year 2045 and the overshoot (=
biocapacity – EF) becomes zero. Until the year 2045 persistent ecological overshoot resulted in accumulation
of ecological debt (equal to the area under the EF curve and above the biocapacity curve for all years that EF >
biocapacity, labeled “Ecological debt”). Continuing decline of the global EF results in the buildup of
19 1/20/2011 The Sustainability Revolution
John C. Ayers
“biocapacity reserve” (green area) that offsets the accumulated ecological debt. We can build up reserves xvii
only if we decrease demand until it is less than supply. Figure 8. Sustainability trends over time. From Leape and Humphrey (2010). Figure 9. Global biocapacity and ecological footprint values in acres in the year 2008.
Sustainability requires that the ecological footprint be reduced until it is equal to or less than the
biocapacity, so that ecological overshoot is eliminated. Adapted from Hails (2008). 20 1/20/2011 Chapter One: Principles Figure 10. Schematic illustration showing change...
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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