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The report examines the transition of cookstove carbon credits from legacy methodologies, which faced allegations of over-crediting, to more rigorous, CCP-approved standards. It identifies monitoring, reporting, and verification (MRV) as a high-concern risk due to complex human behaviors like stove stacking and the Hawthorne effect, while highlighting the role of new tools like MoFuSS and the forthcoming CLEAR methodology in improving credit integrity.

The report analyzes 32 Air Service Agreements (ASAs) among COFFIS member states, finding that while the Chicago Convention does not prohibit aviation fuel taxes, specific bilateral and multilateral ASAs may create legal barriers. It identifies two categories of agreements requiring reform: those with full tax prohibitions and those with non-discrimination clauses. The report suggests that while bilateral reforms are possible, a global or multilateral Joint Agreement would be a swifter method for bulk reform. For EU member states, the EU Energy Taxation Directive (ETD) is the primary barrier, though an international agreement could override it. The report also includes emission quantifications and revenue estimates for three UK-based ASAs.

The document outlines strategies for Indonesia to reduce road transport emissions, which currently account for 95% of transport emissions. Using an 'avoid-shift-improve' framework, the assessment finds that a combination of reducing travel demand, shifting to public and active transport, and improving vehicle efficiency through electrification and biofuels could reduce emissions by up to 84% by 2050. These measures would also significantly lower premature deaths caused by air pollution, particularly from PM2.5 and NOx exposure.

The U.S. government utilizes programs like CLEEN, ASCENT, and NASA's flight testing to advance sustainable aviation. The Continuous Lower Energy, Emissions, and Noise (CLEEN) program focuses on aircraft electrification, advanced wing materials, and emission reductions, with the first two phases expected to reduce fuel consumption by 51.1 billion gallons by 2050. The Aviation Sustainability Center (ASCENT) coordinates universities and private stakeholders on sustainable aviation fuels and airworthiness standards. Additionally, NASA and Boeing are developing the X-66A experimental aircraft to test the Transonic Truss-Braced Wing Design, which could reduce fuel consumption and emissions by up to 30% compared to current single-aisle airliners.

The report analyzes the impact of passenger vehicles manufactured before 2004 in California, finding that while they represent only 19% of registered vehicles, they produce the majority of nitrogen oxides and reactive organic gases. This pollution contributes to the formation of PM2.5, which is linked to significant health issues and premature deaths. The study demonstrates that exposure to this pollution is inequitably distributed, disproportionately affecting Latino, Black, and low-income communities, particularly in Southern California. The authors recommend prioritizing vehicle replacement incentives for disadvantaged populations and expanding non-private transportation alternatives.

The document analyzes the growth of commercial aviation and its contribution to climate change. It details the composition of aircraft emissions, the significant warming effect of contrail-induced cirrus clouds, and the projected recovery of air traffic following the COVID-19 pandemic. While aircraft efficiency has improved, the overall volume of passengers and freight is expected to increase, potentially tripling emissions by 2050. The brief also discusses regulatory efforts, such as ICAO's CO2 standards, and the disproportionate per capita fuel consumption in the United States.

The document analyzes the climate impact of commercial aviation, noting that while aircraft efficiency has improved, the rapid growth of the industry—particularly in developing nations—continues to drive up total emissions. It details the contributions of CO2 and non-CO2 effects like contrails, the regulatory landscape including ICAO standards, and the projected recovery of air traffic following the COVID-19 pandemic.

The study finds that in most U.S. states, financing and owning an EV is cheaper on a monthly basis than an equivalent gasoline car, despite higher sticker prices. This advantage is heavily dependent on the $7,500 federal tax credit; without it, most EVs become more expensive during the loan repayment period. The research highlights that while total cost of ownership (TCO) is significantly lower for EVs over a vehicle's lifetime, consumers are often deterred by upfront costs. Increasing the federal tax credit to $10,000 would make EVs cheaper in nearly every state-vehicle comparison evaluated.

The document analyzes the growth of commercial aviation and its contribution to climate change, noting that while aircraft efficiency has improved, increasing traffic is driving up total emissions. It details the specific warming effects of CO2 and contrails, the role of air freight, and the economic drivers—particularly the expanding middle class in Asia—that are projected to triple commercial aircraft emissions by 2050. It also discusses international and U.S. regulatory efforts to set CO2 standards for new aircraft.

The Union of Concerned Scientists conducted a poll of 1,000 GM owners in March and April 2020. The findings indicate that GM's lawsuit to revoke the authority of California and other states to set vehicle pollution standards significantly damaged its reputation, with favorability dropping from 93% to 44%. The poll found that 87% of GM owners believe the company should support stronger pollution standards. Consumer support for the lawsuit decreased when participants were informed about GM's low environmental performance ranking, the closure of the Lordstown, Ohio plant, and the projected $160 billion cost to consumers through 2050. Consequently, the number of owners considering another brand rose from 30% to 67% after learning about these corporate activities.

A December 2019 poll of 1,000 Toyota owners indicates that the company's decision to join a lawsuit against vehicle emissions standards significantly damaged its brand favorability and customer loyalty. While initial favorability was high, 81% of owners believe Toyota should support stronger pollution standards. After learning about the lawsuit and the fact that Toyota's fleet emissions worsened from 2012 to 2017, favorability dropped from 98% to 66%, and the percentage of owners who would definitely purchase another Toyota fell from 78% to 47%.

The document argues that current NDCs insufficiently address the transport sector, which accounts for approximately one-quarter of energy-related CO2 emissions. It advocates for a comprehensive approach based on the "Avoid-Shift-Improve" framework: avoiding unnecessary travel through land-use planning, shifting to low-carbon modes like public transit and cycling, and improving vehicle technology via electrification and fuel efficiency. The authors identify three primary opportunities for NDC enhancement: accelerating electrification and fuel economy, amplifying avoid-and-shift measures, and addressing freight emissions through clean fuels and information technology.

The document details the costs and benefits of transitioning to clean transportation in Connecticut. By 2050, a total investment of $51.5 billion in electrification, fuel efficiency, and low-carbon fuels is projected to generate $72.5 billion in returns, resulting in a net benefit of over $21 billion. These investments would lead to 149.9 million metric tons of avoided CO2 and a reduction of 15.5 billion gallons of fossil-based liquid fuels.

The document details the costs and benefits of transitioning to clean transportation in the District of Columbia. It estimates that a total investment of $5.6 billion by 2050 will generate a cumulative net benefit of more than $2.5 billion, primarily driven by fuel savings. The transition is expected to reduce carbon dioxide emissions by nearly 17 million metric tons and save almost 1.8 billion gallons of fossil-based liquid fuels by 2050.

The document details the costs and benefits of transitioning Delaware to clean transportation technologies, including vehicle electrification, fuel efficiency, and low-carbon fuels. It projects that a total investment of $18 billion by 2050 will generate a cumulative net benefit of $6.6 billion, primarily driven by fuel savings and avoided environmental costs, while significantly reducing carbon dioxide emissions.

The analysis evaluates three technology pathways—fuel efficiency, vehicle electrification, and low-carbon fuels—to reduce transportation emissions. For Massachusetts, a total investment of approximately $94 billion through 2050 is projected to generate a cumulative net benefit of nearly $40 billion, driven primarily by fuel savings and avoided environmental costs. By 2050, these measures would avoid 276.8 million metric tons of CO2 and reduce fossil-based liquid fuel use by nearly 29 billion gallons.

The document details the costs and benefits of transitioning to clean transportation in Maryland, projecting a cumulative net benefit of nearly $40 billion by 2050 through fuel efficiency, electrification, and low-carbon fuels.

The document details the financial and environmental impacts of transitioning to clean transportation in Maine. It estimates that a total investment of nearly $27 billion by 2050 would yield nearly $37 billion in returns, resulting in a net benefit of over $9 billion. Key benefits include significant fuel savings, reduced carbon dioxide emissions, and improved local air quality.

The document details the costs and benefits of transitioning New Hampshire's transportation sector to clean technologies by 2050. It projects a cumulative net benefit of approximately $8.6 billion, driven primarily by fuel savings, while estimating a total investment of nearly $22 billion, with electricity generation and storage being the largest cost. Environmentally, the transition is expected to avoid over 63 million metric tons of carbon dioxide and reduce fossil fuel use by more than 6.5 billion gallons by 2050.

The document details the costs and benefits of three technology pathways—fuel efficiency, electrification, and low-carbon fuels—for New Jersey. It projects that by 2050, a total investment of nearly $122 billion will generate over $171 billion in returns, resulting in a cumulative net benefit of almost $50 billion. These transitions are expected to reduce carbon dioxide emissions by 353.6 million metric tons and save nearly 37 billion gallons of fossil-based liquid fuels by 2050.