The life cycle GHG emission factors of biofuel blends (GEbiofuel blends) as presentedinEq.(4) has been estimated based on the life cycle assessment of cassava ethanol and palmoil diesel in Thailand (Bonnet et al.,2009;Nguyen and Gheewala, 2008 a,b;Pleanjai et al.,2009) complemented with several assumptions as follows. The
fertilizer usage value and crop yields were calculated based on national average figures for the years 2006–2008.