The requirement by which, under the Kyoto Protocol and sound voluntary market standards, carbon credits will be awarded only to project activities where emissions reductions are "additional to those that otherwise would occur", i.e. additional reductions compared to the "baseline scenario".
"Glossary", Ecosecurities Limited. "Challenges for a business case for high-biodiversity REDD Projects and Schemes."- A Report for the Secretariat of the CBD, February 2009, Version1.2
Terminology Bulletin: Administrative and Financial Terms, TB23 Rev3, FAO, 1994.