additionality

additionality
 n.— «It raised a concern that industry insiders refer to as “additionality.” Some believe that in order for the offsets to be considered legitimate, companies or farms must use the money for the carbon offset purchases to employ measures greater than those previously used. In short, the money must provide an additional impact into reducing carbon in the environment.» —“CAO would ‘welcome’ investigation into carbon offsets” by Jordy Yager The Hill (Washington, D.C.) Feb. 5, 2008. (source: Double-Tongued Dictionary)