Publications: United States


Provides a brief overview of the energy cost per mile for a vehicle using gasoline versus the energy cost per mile using electricity in the United States. 


Finds that ILUC emissions from energy cropping are highly sensitive to assumptions of the composition of marginal lands and suggests that additional sustainability safeguards may be necessary for energy cropping in order to ensure that it only occurs on low-carbon stock land.


Explores some of the compliance pathways available to heavy duty vehicle manufacturers. Specifically, this paper develops hypothetical technology packages for certain types of tractor trucks, vocational vehicles, and trailers using distinct technology strategies compares cost-effectiveness.


Compares the fuel efficiency of 20 airlines operating nonstop flights between the mainland United States and East Asia and Oceania and extends the previous transatlantic fuel efficiency methodology to the transpacific market.


A sharp increase in revenue passenger miles drove both profits and fuel consumption on domestic operations up between 2014 and 2016 for U.S. airlines. Alaska Airlines again ranked first in overall fuel-efficiency, while the gap between it and the least fuel-efficient carrier, Virgin America in 2016, widened slightly to 26%.


Summarizes policies and actions that are expanding access to electric transportation in the United States and showcases several examples of equity-focused electric mobility practices that are encouraging their utilization more widely. 


Survey-based summary of regulatory agencies' programs to monitor and enforce compliance with vehicle emission and fuel consumption standards.


Identifies 20 cities with the highest electric vehicle uptake through 2016 and examines the associated local policies, incentives, and infrastructure that have helped spur electric vehicle sales growth.


Investigates the gap between real-world and official CO2 emission values in the four largest vehicle markets in the world: China, the EU, Japan, and the United States. The analysis shows that the gap has increased in all markets since 2001. 


Looks into the potential and challenges of commercial-scale alternative jet fuel (AJF) production and use based on United Airlines and AltAir’s experience including its challenges, successes, and lessons learned. 


Assesses charging infrastructure deployment practices, challenges, and emerging best practices in major electric vehicle markets. Statistically analyzes the relationship between public charging and electric vehicle uptake at the metropolitan area level to better discern local infrastructure variation, practices, and circumstances.


Assesses zero-emission heavy-duty vehicle technologies to support decarbonization of the freight sector in the 2025–2030 timeframe. Synthesizes data from the research literature, demonstrations, and low-volume commercial trucks regarding their potential to deliver freight with zero tailpipe emissions. Analyzes the emerging technologies by their cost of ownership and life-cycle greenhouse gas emissions for China, Europe, and the United States.


An analysis of advanced biofuel policies and recommendations for improving the effectiveness of policy support for emerging low carbon fuel technologies.


Legal brief summarizing public access to vehicle emissions data in the EU and US.


Analyzes the benefits of establishing separate engine CO2 standards in addition to full-vehicle regulations to specifically drive improvements in heavy-duty engine efficiency. Outlines a possible pathway for the development and implementation of separate engine CO2 standards for heavy-duty vehicles within the regulatory framework of the European Union.


Evaluates well-to-wheel greenhouse gas emissions from soot-free urban transit bus types in 20 megacities.


Reveals that the efforts made by multiple Transport Task Group (TTG) countries to promote and support policies and programs—including stringent tailpipe emissions standards, fuel economy standards, low sulfur fuels, and green freight programs—are in good alignment with the long-term perspective and pathways of the Transport Task Group defined in the G20 Energy Efficiency Leading Programme.


A summary of the technology and policy landscape encompassed by the phrase "new mobility," and survey of considerations involved in ensuring that new mobility developments support and advance the goals of clean transportation.


Examines the link between soybean and rapeseed biodiesel and palm oil in light of a new study on substitution effects.


Assesses the U.S. electric vehicle market and the factors that are driving it. Catalogues electric vehicle promotion activities. Identifies best practice policies in the 50 most populous U.S. metropolitan areas. Conducts a statistical analysis to discern links between the promotion actions and electric vehicle uptake.