National Academies Press: OpenBook

Critical Issues in Transportation 2019 (2018)

Chapter: Energy and Sustainability

« Previous: Serving a Growing and Shifting Population
Page 10
Suggested Citation:"Energy and Sustainability." National Academies of Sciences, Engineering, and Medicine. 2018. Critical Issues in Transportation 2019. Washington, DC: The National Academies Press. doi: 10.17226/25314.
Page 10
Page 11
Suggested Citation:"Energy and Sustainability." National Academies of Sciences, Engineering, and Medicine. 2018. Critical Issues in Transportation 2019. Washington, DC: The National Academies Press. doi: 10.17226/25314.
Page 11

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

a. How can rural and farm access to services and markets be sustained as populations and resources for infrastructure decline and if competition among freight carriers for transporting goods decreases? As populations and tax bases decline, how will rural highway routes be funded? b. Access is a particular challenge for the economically disadvantaged, the elderly, and the disabled, who lack transit options and service by TNCs due to low population densities and an absence of high-speed Internet service in many rural areas. How can rural populations be ensured adequate access to jobs and services? How is that access changing? Which policies are needed to provide adequate rural access? 9. Although many Millennials, the largest population cohort, are living in center cities, the largest portion are settling in the urban periphery or in areas between urban centers within megaregions,36 making it more difficult to provide nonautomobile options. Most Baby Boomers continue to prefer single-family homes in the suburbs (about two-thirds) or in rural areas (more than one-quarter).37 What are the transportation implications of these trends among the largest population cohorts? How can adverse environmental effects from transportation be minimized? Energy and Sustainability Drastic reductions in greenhouse gas (GHG) emissions are needed in the coming decades from all sectors to avoid the possibility of catastrophic climate change.38 Transportation now accounts for the largest share (28.5%) of U.S. GHG emissions.39 Moreover, other sectors are reducing carbon emissions much faster than transportation.40 Transportation may be the most challenging sector to address because of its requirements for high-energy density fuels, particularly for aviation, large ships, and long-haul trucking. Largely for this reason, even if and when the nation confronts transportation’s role in climate change, oil and natural gas will continue to be major sources of transportation energy in the United States and internationally for many years to come. Adverse environmental effects result not only from producing, shipping, and combusting energy, but also from mining and manufacturing the many components of vehicles, including the materials needed for rechargeable batteries.41 (The public health consequences of vehicle emissions are discussed in the Safety and Public Health section of this report.) Critical questions in moving toward sustainability include determining the most cost-effective strategies for reducing GHG emissions; accounting for the full environmental consequences of mining, producing, and consuming transportation fuels and vehicle and battery components; deciding on the appropriate public- and private-sector roles in facilitating and achieving the conversion to both battery and hydrogen powered electric-drive vehicles; and building public and political support for implementing the most effective strategies. Research challenges include addressing a transition to low-GHG energy sources for transportation that is more driven by public good than private benefits, uncertainty about both future technologies and their economics, and consumer willingness to pay for energy efficiency, among other topics. 10. Transportation in the United States generates more GHG emissions than any other sector and its share is growing, largely due to fossil fuel consumption.42 To make a proportional contribution to reducing GHGs, however, reductions from transportation would need to go beyond the aggressive federal fuel economy and GHG standards adopted in 2012 (which themselves are being reconsidered as too trb | transportation research board10

aggressive at the time of this writing).43 What are the most cost-effective strategies to stabilize and ultimately reduce GHG emissions? What is the role of transportation in achieving this goal?44 Other key challenges include reliably monitoring and confirming progress toward GHG reduction goals; the potential for public– private collaboration in achieving reduction goals; the respective sectoral roles in increasing energy efficiency and reducing carbon intensity, reducing motorized travel, and improving system efficiency; identifying the necessary policy actions and technological advances; and managing the transition to automated vehicles to reduce GHGs rather than increase them.45 11. The price of transportation fuel and motor fuel taxes and other transportation fees do not reflect the social and environmental costs that transportation imposes. Hence, society cannot depend on market forces alone to identify and apply environmentally sustainable energy sources for motor vehicles, aircraft, and vessels in the coming decades. What are the most consequential and cost-effective public policy strategies to move the transportation sector toward sustainable energy sources while taking into account the full environmental consequences from the energy source through consumption, emissions, and recycling of spent vehicles and components? 12. As major industrialized nations impose zero- and low-emission requirements, automakers are responding with promises to shift to the production of electric, plug-in hybrid, and hydrogen fuel cell vehicles, which raises questions about the public role in encouraging electrification of the fleet and the impact that growing electricity demand will have on the energy grid and overall emissions. a. How can public policy influence consumer acceptance of electric vehicles?46 What is the appropriate public role in facilitating the distribution and adequate coverage of hydrogen and battery refueling and recharging infrastructure? What policies will work and be most cost effective? b. What are the implications of the growing reliance on electrical power in transportation and how can electrification be managed to gain the most societal benefit? i. Using electricity to power transportation vehicles could reduce GHG emissions, but the scale of the benefits depends on the source of energy (coal, gas, petroleum, nuclear, renewables)47 that electric utilities choose or are incentivized to employ. How can the public sector best affect these choices? ii. What will be the impact of growing demand from transportation on the electric grid? How can utilities and public agencies, as needed, encourage the timing of recharging to maximize benefits for the grid and users?48 c. What is the potential for transportation infrastructure itself to generate energy from solar radiation, wind, or other environmentally sound sources? 13. Sustainability requires that there be long- term consideration of the implications of decisions and policies on social, economic, and environmental systems. Examples include making decisions based on life-cycle cost considerations and the long-term vitality of communities and key natural environmental systems. How can consideration of long-term sustainability goals be better incorporated into public policy debates and decisions about transportation? critical issues in transportation 2019 11

Next: Resilience and Security »
Critical Issues in Transportation 2019 Get This Book
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF

The coronavirus (COVID-19) pandemic and equity issues will be included soon in

Critical Issues in Transportation 2019

. In this report, which is updated periodically by the TRB Executive Committee, a series of challenging questions are posed to explore issues and opportunities that may arise 10 to 20 years into the future. These questions, 63 in all, have been organized into 12 topic areas and provide a way to frame future areas of research, policy analysis, and debate.

Critical issues identified in this report deserve attention because of transportation’s central role in serving individuals and society. This document serves to sharpen society's collective understanding of transportation and its ramifications, while informing decisions by individual citizens and officials in both the public and private sectors. The issues have been identified and documented from a U.S. perspective, and are also common across developed nations.

Download the executive overview, Critical Issues in Transportation: Policy Snapshot and or visit from your mobile device.

On March 5, 2019, TRB and the National Transportation Safety Board (NTSB) cohosted a webinar that covered TRB’s Critical Issues in Transportation 2019 report and the 2019-2020 NTSB’s Most Wanted List. Presenters focused on issues of safety and security across all modes of transportation.

  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook,'s online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!