"Carsharing exemplifies a growing trend towards service provision displacing ownership of capital goods. We developed a model to quantify the impact of carsharing on greenhouse gas (GHG) emissions. The study took into account different types of households and their trip characteristics. The analysis considers five factors by which carsharing can impact GHG emissions: transportation mode change, fleet vintage, vehicle optimization, more efficient drive trains within each vehicle type, and trip aggregation. Access to carsharing has already been shown to lead some users to relinquish ownership of their personal vehicle. We find that even without a reduction in vehicle-kilometers traveled the change in characteristics of the vehicles used in carsharing fleets can reduce GHGs by more than 30%. Shifting some trips to public transit provides a further 10%–20% reduction in GHGs"

Key findings

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"Households with children had both the highest emission baseline and the largest emission reduction potential in absolute terms through carsharing."

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"Using carsharing services without changing transportation modes, reduces emissions by 19%–20% due to the newer fleet; and a further 16%–19% due to vehicle optimization."

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"The maximum emission reduction potential of carsharing is expected to be in the range of 48%–55%."

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