Objective. In this paper, we focused on CO₂ emissions due to the cell phone with PEFC as an alternative to Li-ion battery. Especially, assuming that the PEFC operation was fueled by Bio-H₂ which was synthesized through the biomass gasification process of Blue Tower process, the CO₂ emissions of the PEFC cell phone were estimated. Also, using the questionnaire on the usability of cell phone, we investigated the user condition in each generation which covered under 20's to over 50's. In this study, our purpose is to find a significant condition by which the CO₂ abatement benefit against the cell phone use with Li-ion battery based on the responses of questionnaire and the experimental test of PEFC operation. However, according to the conventional LCI analyses, the indirect CO₂ emission is too much in comparison to the direct CO₂ emission of fuel origin. Thus, the alternative to fossil fuels might not be contributed to CO₂ abatement. On the other hand, the number of familiarized cell phone with Li-battery is approximately 3.6×10⁷ machines as of 2008. Also, the energy consumption of a cell phone would be increased due to the multiple functions. That is, from the viewpoints of global protection, the LCI analysis on CO₂ emission on the cell phone with PEFC to which Bio-H₂ would be fueled has a significant meaning.<BR>Results and Discussion. Based on the experimental results, the specific Bio-H₂ consumptions of talking and standby duration times were 21.67 NmL/min and 0.23 NmL/min at H₂ concentration of 50 vol.%, respectively. The fuel consumption rate at 100 vol.% of Bio-H₂ were 7.70 NmL/min and 0.09 NmL/min, respectively. Also, the specific CO₂ emission of Bio-H₂ at 50 vol.% was 14.293 to 56.114 g-CO₂/MJ, and that the emission at 100 vol.% was 26.820 to 76.435 g-CO₂/MJ. For instance, in the case of PEFC cell phone use at H₂ concentration of 100 vol.%, the CO₂ abatement would be approximately 36.4% to 87.9% in comparison to the conventional Li-ion cell phone. In this estimation, those would be affected by rather the ratio between the direct CO₂ emission and the indirect one than the CO₂ emission due to fuel origin.<BR>Conclusions. Due to the improvement of the indirect factors such as manufacturing and/or raw materials on cell phone equipment etc. or the increase in energy consumption, CO₂ abatement against the conventional cell phone would be obtained by the promotion of the PEFC cell phone of Bio-H₂.