"Sustainability" means "whatever leftists think they want at the moment".
This is not to be confused with what leftists said they wanted yesterday or what they'll say they want tomorrow.
They want what they want, they want it now, and if they don't get it the world will end.
This is how things are to be forever.
Actually, seriously,
leftists DO derive their power from ambiguity and unequal application of law.
I looked at the “Global Alliance for Clean Cookstoves” web site. I could not find what they are using to replace the wood and dung used in third world kitchens. Does anyone know? My first guess would be some sort of petroleum product, but cannot tell from the continual lack of details on the Left (your point). If they actually told people what their intent was, there would be an instant response. Can’t have that, you know. Got to keep the proles in the dark.