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Singapore aims for climate neutrality after 2050, focusing on hydrogen as a key decarbonization enabler due to its limited renewable energy potential. The country's economy is heavily export-oriented, with industrial activities and the power sector contributing 46% and 39% of GHG emissions, respectively. Singapore is exploring low-carbon hydrogen for electricity generation, heavy-duty transport, and industrial fuel, while considering ammonia for maritime bunkering. While blue hydrogen is feasible, the lack of domestic geological formations for CO2 storage necessitates partnerships with neighboring countries. Singapore leverages its position as a global port and refining hub to aim for a future role as a hydrogen hub within a developing global supply chain.

The document compares four categories of electrified vehicles. Conventional hybrids use regenerative braking to charge batteries and improve fuel economy. PHEVs combine an internal combustion engine with a plug-in battery, allowing for short distances of gasoline-free driving. BEVs run exclusively on electricity, producing no tailpipe emissions and offering the longest electric ranges. FCEVs use hydrogen gas to generate electricity, emitting only water from the tailpipe, though their environmental impact depends on the hydrogen production method and infrastructure is currently limited primarily to California.

The Union of Concerned Scientists finds that PM2.5 pollution from cars, trucks, and buses in California is inequitably distributed, with African American, Latino, and Asian residents, as well as low-income households, facing significantly higher exposure than white and wealthier residents. The analysis identifies Southern California, particularly Los Angeles County, as having the highest average exposure, and estimates that on-road transportation leads to approximately 3,100 premature deaths annually in the state.

Heavy-duty vehicles, while comprising only 5% of US road vehicles, contribute over 25% of vehicle-based global warming emissions and significant air pollution. The document advocates for the adoption of battery- and fuel cell-electric trucks and buses to eliminate tailpipe emissions and improve public health, particularly in low-income communities and communities of color. It highlights that battery-electric buses are currently the lowest-carbon option across the US and calls for government policies, including adoption targets and manufacturer standards, to accelerate this transition.

The 2018 Automaker Rankings by the Union of Concerned Scientists finds that while average emissions from new vehicles have reached record lows, the pace of reduction is slowing due to a market shift toward SUVs and inconsistent investment in efficiency technologies. Honda is the top-performing full-line manufacturer, while Tesla leads overall with an all-electric fleet. The 'Detroit Three' (Ford, GM, and Fiat Chrysler) consistently underperform compared to the industry average. The report details the deployment of fuel-saving technologies—such as gasoline direct injection, cylinder deactivation, and electrification—and argues that strong federal standards are essential to prevent manufacturers from prioritizing performance over emissions reductions.

The document examines biomethane derived from landfills, wastewater treatment centers, and dairies as a replacement for diesel and natural gas in California's heavy-duty vehicle fleets. While acknowledging its climate benefits over fossil fuels, the authors highlight that California's total biomethane potential from waste would meet only 3% of the state's natural gas demand and 15% of its diesel consumption. The report warns that promoting compressed natural gas (CNG) vehicles could inadvertently increase reliance on fossil natural gas due to this supply gap. It concludes that biomethane provides the greatest emissions reductions when used to generate electricity or hydrogen for electric vehicles, but that battery electric vehicles powered by the grid remain the most effective path for meeting climate goals.

The report argues that electrifying heavy-duty vehicles in California can significantly reduce hazardous air pollutants and global warming emissions while creating economic opportunities. It finds that battery and fuel cell electric buses have substantially lower life cycle emissions than diesel or CNG alternatives. The authors highlight that low-income communities and people of color are disproportionately exposed to heavy-duty vehicle pollution. While the sector offers growth in manufacturing, infrastructure, and maintenance, the report emphasizes the need for targeted electrical skills training to make these jobs accessible to underserved populations.

The document advocates for increasing electric vehicle (EV) availability in the Northeast and Mid-Atlantic, noting that while 55% of regional consumers are interested, availability lags significantly behind California. It calls for the expiration of a regulatory exemption that allows sales in California to count toward compliance in Northeast states and suggests updating ZEV program credits to account for rapid improvements in battery range.

The document argues that electrifying heavy-duty vehicles in California can significantly reduce air pollution and global warming emissions while creating job opportunities for underserved communities. It provides a life cycle emissions analysis comparing battery and fuel cell electric buses to diesel and CNG alternatives, finds that current EV technology meets many urban operational needs, and recommends targeted workforce training and financial incentives to ensure an equitable transition.

The Union of Concerned Scientists analysis finds a significant disparity in how automakers deploy electric vehicles (EVs) across the United States. While BMW, General Motors, Nissan, and Tesla are identified as leaders, others like Honda, Toyota, and Fiat Chrysler are labeled laggards due to limited model availability or a lack of plug-in offerings. The report highlights a stark geographic divide, noting that California's Zero Emission Vehicle policy has made it the only state where all available US EV models are offered, while consumers in other regions face severe shortages of EVs at dealerships.

The report analyzes the US electric vehicle (EV) market as of 2016, finding that while cumulative sales were nearing 500,000, progress among automakers is uneven. BMW, General Motors, Nissan, and Tesla are identified as leaders, while Honda, Toyota, and Fiat Chrysler are characterized as laggards. A significant disparity in vehicle availability exists between California and the rest of the US, largely attributed to California's Zero Emission Vehicle (ZEV) program. The authors argue that limited model availability and poor dealership inventory outside California hinder the national transition to electric transportation.

Fuel cells generate electricity through a chemical reaction between oxygen and hydrogen, offering a high-efficiency, low-emission alternative to combustion engines and batteries. While they excel in reliability, scalability, and energy density, widespread adoption is hindered by high costs—particularly the need for platinum in PEM cells—and the lack of hydrogen fueling infrastructure. Applications range from portable electronics and stationary power (including combined heat and power systems) to transportation. In the U.S., the Department of Energy and various state-level policies, such as Renewable Portfolio Standards and tax credits, are working to reduce system costs and expand infrastructure to make fuel cells more competitive with gasoline-powered vehicles.

The document examines how different hydrogen sourcing methods—ranging from fossil-fuel-based steam methane reforming to renewable electrolysis and biomass gasification—affect the total lifecycle emissions of fuel cell electric vehicles. It highlights that while current natural gas-based production already reduces emissions compared to gasoline vehicles, transitioning to renewable feedstocks and distributed production can further minimize the climate impact.

Battery electric vehicles (BEVs) use electricity stored in battery packs to power motors, producing no tailpipe emissions and offering lower fueling costs than internal combustion engines. While their total pollution depends on the electricity source, they remain cleaner than gasoline cars even on coal-heavy grids. BEVs feature energy-saving technologies like regenerative braking and typically offer ranges between 70 and 265 miles.

Plug-in hybrid electric vehicles (PHEVs) combine internal combustion engines with electric motors and rechargeable batteries, allowing for extended all-electric driving and reduced global warming pollution. They operate in all-electric and hybrid modes, utilizing features like regenerative braking and idle-off to increase fuel efficiency. Unlike battery electric vehicles, PHEVs retain a combustion engine for when the battery is depleted, and unlike conventional hybrids, they can be recharged via an external power outlet.

The document outlines strategies to maximize vehicle fuel economy, categorizing them into vehicle maintenance, driving behavior, and systemic transportation changes. It highlights that proper maintenance, such as using low rolling resistance tires and reducing vehicle weight, can improve mileage. Driving habits, specifically reducing highway speeds and avoiding idling, are identified as key ways to cut fuel use. Finally, it advocates for a transition toward fuel-efficient vehicles, mass transit, and policies that reduce dependence on oil.

Amory B. Lovins, CEO of RMI, submits comments to NHTSA challenging the technical basis of its proposed rulemaking on automobile fuel economy standards. He argues that NHTSA incorrectly relies on retrospective correlations between vehicle weight and safety, which fail to account for modern materials like advanced polymer composites and high-strength steels. Lovins asserts that these materials can create vehicles that are simultaneously large, lightweight, and safe, thereby eliminating the perceived tradeoff between fuel economy and crashworthiness. He recommends that CAFE standards be performance-based, technology-forcing, and based on size metrics rather than mass to avoid incentivizing a 'mass arms race' and to maintain the global competitiveness of U.S. automakers.

Amory B. Lovins argues that the 10-20% hydrogen leakage rate assumed by Tromp et al. is unsupported and technically implausible. He contends that boiloff from liquid hydrogen (LH2) tanks does not equate to atmospheric emissions because it is used as fuel or catalytically oxidized. Furthermore, Lovins asserts that compressed gaseous hydrogen (GH2) is the industry norm due to superior economics, lower mass, and adequate range, whereas LH2 remains a niche technology with poor economic prospects.

The report argues that the US can significantly reduce its oil consumption and environmental footprint by aggressively raising Corporate Average Fuel Economy (CAFE) standards. It proposes a path to 40 mpg by 2012 and 55 mpg by 2020 using evolutionary conventional technologies and hybrid electric vehicles. The analysis suggests these improvements would save consumers billions of dollars, create over 100,000 automobile industry jobs by 2020, and reduce greenhouse gas emissions by 888 million tons by 2020. Furthermore, the report contends that these fuel savings would far exceed the potential oil supply from the Arctic National Wildlife Refuge and that safety can be maintained or improved through better design and the reduction of weight disparity between light trucks and passenger cars.

The Build Back Better Act (H.R. 5376) allocates $555 billion to climate change and clean energy to reduce emissions by over one billion metric tons by 2030. The legislation employs a sector-wide approach, providing tax credits and grants for zero-emission vehicles, clean hydrogen, carbon capture (via enhanced 45Q credits), and renewable energy. It specifically targets the decarbonization of heavy industry, the power sector—including support for existing nuclear plants—and agricultural and forestry sequestration, while directing 40% of investment benefits to disadvantaged communities.