The Pongamia system showed a drastic decrease in
AP of 90% compared to the reference system. The
biggest contribution is made during the biogas
combustion in an engine, where 96% of the total AP is
associated with SOx and NOx from biogas combustion,which still is very negligible or may be considered nil
compared to Jatropha (Wouter et al. 2010), Soya,
rapeseed biodiesel system (Cherubin et al., 2009).
Eutrophication potential has not been considered since
inorganic fertilizer and pesticides are not used in the
system and in view of the fact that acidification potential
results are quite negligible. From the above graph
(Figure 4) it is quite evident that energy and
environmental foot print of Pongamia is very less
compared to fossil fuel and Jatropha biodiesel system.
Hence Pongamia can be recommended as an ecologically
friendly tree or tree which has very little global warming
potential