Transportation carbon emissions7/22/2023 ![]() The other 29.4% comes from trucks carrying freight. Most of this comes from passenger vehicles – cars and buses – which contribute 45.1%. Road travel accounts for three-quarters of transport emissions. This data is sourced from the International Energy Agency (IEA). In the chart here we see global transport emissions in 2018. How do these emissions break down? Is it cars, trucks, planes or trains that dominate? Thanks to BETO Systems Development and Integration Program Manager Jim Spaeth and VTO Technology Manager for Advanced Engine and Fuel Technologies Kevin Stork for their work as contributing authors on this story.Transport accounts for around one-fifth of global carbon dioxide (CO 2) emissions. Led by EERE’s Bioenergy Technologies Office (BETO) and Vehicle Technologies Office (VTO), partners include Argonne, Idaho, Lawrence Berkeley, Lawrence Livermore, Los Alamos, Oak Ridge, Pacific Northwest, and Sandia national laboratories the National Renewable Energy Laboratory and more than 35 industry and university partners. The Co-Optima initiative leveraged synergies across DOE’s Office of Energy Efficiency and Renewable Energy (EERE). Read the full report or summary, learn more about the Co-Optima initiative, and get more details on consortium partners and projects. ![]() Ultimately, the new fuels and engines identified through Co-Optima research will burn cleaner, produce fewer lifecycle GHG emissions, and make important contributions to the nation’s transition to a net-zero-carbon-emissions energy future. Research by manufacturers is still needed to determine what more significant changes in engine operation and component materials will be needed to approve use of these sustainable Co-Optima fuels in commercial engines.Īdditional R&D could result in new engine modifications beyond those considered by Co-Optima researchers, delivering even lower costs, lower emissions, and higher efficiency. While discoveries from the Co-Optima team provide a solid foundation for emissions reduction in the near term, challenges remain as industry and the nation as a whole take up the effort to reach net-zero emissions by 2050. Along the way, Co-Optima scientists, engineers, and analysts also invented new methods and tools to expand understanding of combustion and fuel properties. The team screened more than 1,000 options to pinpoint high-performing blendstocks that could potentially be produced at commercial scale from the estimated billion-ton annual supply of domestic biomass resources. The scientists also explain how 99% of some of the most harmful freight truck criteria pollutants could be eliminated.Ĭo-Optima researchers focused on identifying and understanding fuel components known as blendstocks, which can be combined with affordable petroleum-based fuels to improve vehicles’ carbon footprint and engine performance. Plus, researchers identified domestically sourced, bio-based fuels that produce 60% fewer GHG emissions than those generated by petroleum-based fuels when used in on-road vehicles. Improved fuels combined with advanced engines were shown to deliver up to an extra 14% increase in fuel economy. When those new fuels and engines are designed to work together, even more meaningful improvements are possible.Įfficient, pollution-reducing fuels and engine technologies identified by Co-Optima researchers for use in on-road light-, medium-, and heavy-duty vehicles could also cut pollution from marine, rail, off-road, and airplane engines.Ĭo-Optima research revealed ways to improve fuel economy by 10% for today’s turbocharged car engines with new fuel options. On their own, bio-based fuels and advanced engines can deliver modest fuel economy and environmental advantages. Top researchers from national labs across the country set out to give American industry and policymakers the scientific knowledge, data, and tools needed to decide which new fuel-engine combinations for vehicles could most realistically benefit drivers, businesses, and the environment.
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