From the other side of the fence
Dr Dan Barlow, the head of research for Friends of the Earth and a member of the Forthright Alliance, used "sustainable" seven times in 300 words about a new Forth bridge. Sustainable alternatives, least sustainable, sustainable option, sustainable transport, sustainable transport planning, sustainable transport alternatives, neither sustainable nor supportable... He was against a new bridge.
"Sustainable" means a lot to environmental lobbyists. It is like perpetual motion or alchemy - a chimera that takes scant account of reality or practicality. It has been endowed with a mystic quality, such as "renewable" or "consultation", and become an ingredient in roundhead collectivist jargon.