A sustainable economy can include a human society that delivers more good to its members, even while enriching, rather than degrading, the ecosystem we live in.
It is time to put aside, explicitly and decisively, the objective of higher GDP. GDP measures quantity, not quality of production. GDP presumes that a growth in production is a growth in quality of life, when in fact we have reached a point that the opposite is true. Not even our current level of goods production can be sustained, much less continual increases.
From 1700 to 2000 CE, a period of only 300 years, world population increased 10-fold to over 6,000 Million people – a compound annual growth rate of .75 %, ten times higher than in the previous era. More amazing, from 1900 to 2000, the growth rate was over 1.3 %, doubling twice in just 100 years. World population will have increased by almost as many people in the twelve years from 2000 to 2012 as it did in the 6000 years from the invention of the wheel to the invention of the steam engine!