
Additionality is a notional measurement of an intervention (i.e., doing something), when the intervention is compared to a baseline, status quo metric (i.e., doing nothing). The `intervention` can be based on either technology or economics. For an example of a technology based intervention, see the use of the word when discussing carbon credits......
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occurs where too much public money is earmarked for a project, usually due to the fact that it is eligible for assistance from more than one source. In this event an offer might not be made, or might be withdrawn, or percentages reduced. Leverage means quite literally, ...
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http://www.encyclo.co.uk/local/20935

in the context of a carbon offset project, the additionality is the reduction in greenhouse gas emissions that is in addition to what would have resulted in the absence of the project.
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http://www.translationdirectory.com/glossaries/glossary304.php
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