Definition of Biomass - Biomass Gasification, Pyrolysis and Torrefaction - page 459

(b) waste organic material from harvesting or processing agricultural
products, including animal waste and rendered animal fat, forestry
products, including wood waste, and sewage.
3. United Nations Framework Convention on Climate Change (UNFCCC)
offers an alternative definition of biomass that must be used for calcula-
tion of tradable carbon credit under clean development mechanism
(CDM). As per Annex 8 of EB 20 1 Report it is defined as:
Biomass means non-fossilized and biodegradable organic material originating
from plants, animals and micro-organisms. This shall also include products, by-
products, residues and wastes from agriculture, forestry and related industries as
well as the non-fossilized and biodegradable organic fractions of industrial and
municipal wastes. Biomass also includes gases and liquids recovered from the
decomposition of non-fossilized and biodegradable organic material.
It is apparent from above that the first definition is most restrictive and
aimed at one specific need. The third definition of UNFCCC is more general
and scientific.
1 UNFCCC, Annex 8, Clarifications on definition of biomass and consideration of changes in
carbon pools due to a CDM project activity, EB 20 Report, Annex 8, p. 1. cdm.unfccc.int/
Reference/Guidclarif/mclbiocarbon.pdf