I just finished reading Planet Dialectics (http://www.wupperinst.org/Publikationen/buecher/planet_dialectics.html), a collection of papers and articles published by Wolfgang Sachs, a senior researcher at the Wuppertal Institute in Germany (http://www.wupperinst.org/).
Dr. Sachs challenges a lot of the terminology and philosophy centred around Sustainable Development. He investigates the history behind such terms as "resource management", "efficiency", "justice" and of course the always-ambiguous "sustainable development"; revealing that these contemporary concepts are mired in imperialistic, Western-centric roots.
Overall Sachs calls for efficiency balanced with sufficiency; a concept that calls for a fundamental shift in values towards limiting our rate of consumption, rather than simply consuming greater amounts more efficiently.
Totally recommended for EWB'ers interested in investigating sustainable development issues.