MATERIALS

摘要

In the latter half of the 1980s, our civilization crossed an ominous threshold: We began to demand more of the earth's biocapacity annually than it could supply. In fact, since 1961 our global appetite for biologically productive land area has almost tripled, and today it stands at about one and a half times the production capacity of the earth, according to the Global Footprint Network. These ecological statistics are a useful measure of the strong increase in demand on the planet's renewable resources, despite efforts to enact production efficiencies and stabilize rapidly accelerating consumption.