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This study develops an automobile life-cycle analysis framework considering lifetimes of new and used passenger cars. Using the analysis framework based on the Weibull survival distributions of new and used cars, I addressed the question of how the market expansion and lifetime extension of used cars affect life-cycle CO2 emissions through the entire economy. The results show the following.Under the benchmark lifetime function, a 10% increase in the market share of used cars under benchmark average new vehicle lifetime of 11.50 years yields 16.9 million tons of CO2 reduction in the cumulated life-cycle CO2 emissions during 1993–2014. I further found that a combined policy of vehicle lifetime extension and market expansion of “used” cars can contribute toward a low-carbon transition society. I conclude that modifying the demand policy with a focus on “used” cars with higher fuel efficiency, as well as setting a target car age of used cars, would be environmentally beneficial.

CO2 reduction potentials through the market expansion and lifetime extension of used cars