Public Transit and Micromobility as Climate Solutions: What the Data Shows
Rail is 4x more energy-efficient than cars, per the EEA. A single e-bike cuts about 225kg of CO2 a year. Here is the data behind transit and micromobility.
Public transit and micromobility — e-bikes, e-scooters, and shared cycling — are transport modes with substantially lower per-passenger energy use and emissions than private car travel, according to data from the European Environment Agency (EEA) and the International Association of Public Transport (UITP). The EEA finds that buses are twice as energy-efficient as cars, and rail four times more energy-efficient, per passenger-kilometer. UITP data shows that even privately owned electric vehicles consume three times more energy per passenger-kilometer than public transit and produce three times more CO2 — meaning the efficiency gap between transit and cars is not simply a fossil-fuel problem that electrification alone resolves.
What public transit saves in aggregate
UITP’s 50 Statistics That Show How Public Transport Makes Cities Better report estimates that public transport today saves approximately 170 million tonnes of oil consumption and around 550 million tonnes of CO2-equivalent emissions globally. City-level examples illustrate the mechanism: London’s Ultra Low Emission Zone cut annual roadside nitrogen dioxide pollution by 49% between 2016 and 2023, reducing the number of monitoring sites exceeding legal NO2 limits from 56 to 5. In Montreal, dedicated bus lanes improved service efficiency enough that transit authorities removed two buses from a 30-bus daily fleet while maintaining service, cutting an estimated 45 tonnes of emissions annually from that route alone.
What a single e-bike replaces
A 2020 study by McQueen, MacArthur, and Cherry, “The E-Bike Potential: Estimating regional e-bike impacts on greenhouse gas emissions,” published in Transportation Research Part D, modeled e-bike adoption in Portland, Oregon, using mode-replacement ratios drawn from a North American survey of 1,796 existing e-bike owners. That survey found 72.4% of e-bike miles replaced car trips specifically, with the remainder replacing transit, conventional cycling, or walking trips. Applying those substitution patterns, the study calculated that a single e-bike provides an average reduction of 225 kilograms of CO2 per year, after accounting for the emissions from generating the electricity to charge it and for “induced” trips that would not otherwise have been taken. In a scenario where e-bikes captured 15% of person-miles traveled citywide, the study modeled car mode share falling from 84.7% to 74.8% and total passenger transportation CO2 emissions falling 12%, from 8,080 to 7,088 metric tons daily.
How fast micromobility is growing
Electric two-wheelers — a category that includes e-bikes, e-mopeds, and electric motorcycles — reached 10 million units sold globally in 2024, roughly 15% of all two-wheeler sales, with electric models now representing over 9% of the global two-wheeler fleet, according to the International Energy Agency’s Global EV Outlook 2025. China remains the largest market at approximately 7 million sales, though sales there are declining, while Southeast Asian markets are growing quickly — Vietnam sold 250,000 electric two-wheelers at roughly 10% market share, and Africa recorded about 9,000 electric two- and three-wheeler sales with year-on-year growth of approximately 40%, albeit from a small base. Electric three-wheelers surpassed 1 million units sold in 2024, nearly 25% of all three-wheeler sales globally, up from 20% in 2023, with India accounting for about 700,000 of those sales at a 56% electric share of its three-wheeler market.
The OECD-affiliated data on transport emissions growth
The International Transport Forum (ITF), an intergovernmental body hosted within the OECD, publishes the ITF Transport Outlook, which projects that worldwide transport activity will roughly double while emissions rise further absent stronger policy intervention — the broader growth trend that transit and micromobility investment is intended to offset at the margin.
What remains unresolved
The Portland-based e-bike study’s 225 kg-per-bike annual figure and mode-shift modeling reflect one US city’s travel patterns and electricity mix; the authors do not claim the same substitution ratios apply universally, since car-dependency levels, existing cycling infrastructure, and trip-distance distributions vary widely between cities. Similarly, IEA sales data for electric two- and three-wheelers captures units sold rather than confirmed kilometers of car travel actually displaced, since a share of two-wheeler sales — particularly mopeds and motorcycles used for existing non-car trips — do not represent a car-to-bike mode shift in the way the Portland study modeled specifically for e-bikes.
Sources: European Environment Agency, International Association of Public Transport, 50 Statistics That Show How Public Transport Makes Cities Better, “The E-Bike Potential: Estimating regional e-bike impacts on greenhouse gas emissions,”, Global EV Outlook 2025, ITF Transport Outlook
Featured image: photo by Jean Fourche on Pexels (free Pexels license).
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I specialize in sustainability education, curriculum co-creation, and early-stage project strategy. At WINSS, I craft articles on sustainability, transformative AI, and related topics. When I’m not writing, you’ll find me chasing the perfect sushi roll, exploring cities around the globe, or unwinding with my dog Puffy — the world’s most loyal sidekick.
