Renewable
Part of speech: adjective
Definition: Able to be renewed; capable of renewal. With respect to a resource, sustainable; able to be regrown or renewed; having an ongoing or continuous source of supply; not finite.
Part of speech: noun
Definition: Something that can be renewed, but especially a renewable source of energy
Example sentence: There is an urgent need to stop subsidizing the fossil fuel industry, dramatically reduce wasted energy, and significantly shift our power supplies from oil, coal, and natural gas to wind, solar, geothermal, and other renewable energy sources.
Inexhaustible
Part of speech: adjective
Definition: Impossible to exhaust; unlimited.