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The needs of the non-internal combustion engine for the automobile have been increasingly emphasized due to the seriousness of the air pollution in major cities and the global warming. However, such power plant technologies are generally considered to be still far away from the full commercialization as technical issues including infrastructure and cost are still remaining to be solved, so the substantial emission cleanup through the market penetration requires a long time for the realization. For the mean time, attempts are made to investigate the maximum potential of the internal combustion engine for reduction of both exhaust emissions and CO2 focusing on Honda''s near-zero emission Zero Level Emission Vehicle (ZLEV) technology.

In order to reduce CO2 emissions from automobiles, a highly fuel-efficient hybrid vehicle, the “Insight”, has been developed at Honda. Life cycle CO2 emissions are compared for the aluminum-bodied Insight, a simulated steel-bodied Insight, and a conventional gasoline vehicle. Life cycle CO2 emission is still dominated by the in-use fuel consumption. However, the contribution of CO2 emission from material use and processing could increase when the vehicle fuel consumption is greatly reduced. The use of recycled aluminum reduces CO2 emission from the aluminum-bodied Insight.