120-city study: 22% reduction in urban traffic emissions in 15 years without quality of life decline is possible naturesustai
City-level policies are increasingly recognized as key components of strategies to reduce transport greenhouse gas emissions. However, at a global scale, their total efficiencies, costs and practical feasibility remain unclear.
Applying these policies in all cities, we find that total transportation greenhouse gas emissions can be reduced by 31% in 15 years, compared with the baseline scenario. However, the consequences of the same policies vary widely between cities, with specific effects depending on the policy considered, income level, population growth rate, spatial organization and existing public transport supply.
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