sustainable

adj

1. Able to be sustained.
2. Able to be produced or sustained for an indefinite period without damaging the environment, or without depleting a resource; renewable.

   “sustainable economy”

   “In addition to the resources listed in the organic and local food sections earlier, a good source of sustainable meat is Heritage Foods USA (heritagefoodsusa.com).”

   “Some critics have asserted that sustainable food is "elitist"; that it's too expensive and not widely available.”

   “A city on a hill—or many cities on hills—surrounded by unbroken vistas of beautiful countryside; small, thriving, family-run farms growing organic, seasonal, and sustainable fruits and vegetables specific to the region.”

   “Right now, rich nations devour 28 tonnes of material per person per year – including everything from fish to forests, plastics to metals. That’s four times more than ecologists say is sustainable.”

noun

1. A renewable energy source.

   “It has only been in the last 20 years that the long-term trend away from fossil fuels and toward nuclear energy and sustainables has intensified.”