Using non-performing rubber trees as a source of power also helps rejuvenate rubber production by making room for new planting.

VOA: standard.2009.09.13

It seems Pandora is the only place in the galaxy with deposits of a valuable new energy source worth untold millions back on Earth.

VOA: standard.2009.12.19

Cigarette taxes are a vital revenue source for New York State, which has the highest-priced cigarettes in the nation - almost $15 a pack.

VOA: standard.2010.08.11