What's the adjective for sustenance? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs sustain and sustentate which may be used as adjectives within certain contexts.
“These causes may be conveniently divided as in the above diagram, into sustentative and non-sustentative.”
“While applicants have been earning Innovation credits for more than a decade, the USGBC has yet to study the results or use the resulting approaches in sustentative ways.”