Thanks again all for interest and comments.
A different metric for green buildings seems worth pursuing, based and MIPS and more recent research, along lines that Brook and others suggested. .
Based upon Resources used per unit of service, leading to absolute reductions in resource use.
The Factor 10 Manifesto (2000) by Friedrich Schmidt-Bleek and other forward-looking thinkers may be good starting point:
http://www.factor10-institute.org/files/F10_Manifesto_e.pdf[Factor 10 Manifesto 2000.
I will put forward a proposal over next few days that I intend to follow up with CEO of Green Building Council of Australia, and will try to share with you too.
Lockdown (luckily easing here Down Under) is good time for reflection!
David