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The Union of Concerned Scientists reports that the EPA's January 25, 2018, withdrawal of the "once in, always in" (OIAI) policy allows industrial facilities to be reclassified from "major sources" to "area sources" of hazardous air pollutants (HAPs). This reclassification removes the requirement for facilities to use Maximum Achievable Control Technology (MACT), which the authors estimate was used by 70 percent of major sources in 2014 to keep emissions at or below thresholds of 10 or 25 tons per year. The document warns that area sources are not regulated or inspected as stringently, potentially increasing emissions of toxic substances like chlorine, benzene, and styrene. The analysis identifies at least 21 states at risk of increased pollution, with specific high-risk clusters in Louisiana's "Cancer Alley," Houston, Chicago, and the New York-Newark urban area.

The report examines the transition from traditional gray infrastructure to green infrastructure (GI) for stormwater management. It argues that because the benefits of GI are collective while costs are private, public intervention via economic instruments—specifically stormwater markets—is necessary to bridge the investment gap. The document details various price-based and quantity-based instruments, such as stormwater retention credits and environmental impact bonds, and analyzes their application in cities like Washington D.C., Philadelphia, and Halifax.

The Union of Concerned Scientists reports that since the 1950s, US automakers have consistently fought against fuel economy, emissions, and safety standards using 'scare tactics' and claims of technical infeasibility, despite later meeting or exceeding those same standards. While the industry collaborated with the federal government in 2009 to establish flexible standards that have since saved drivers nearly $50 billion, the report claims that industry trade groups are currently attempting to weaken these rules. The document calls for automakers to cease spreading disinformation and support strong, technology-forcing standards.

The document outlines four specific actions for cities to achieve carbon-free electricity: implementing LED smart streetlighting, creating electric districts by removing natural gas infrastructure, installing municipal solar photovoltaics, and leveraging renewable energy supply mechanisms like power purchase agreements.

The report quantifies the health risks faced by millions of African Americans living near oil and gas infrastructure, highlighting elevated cancer risks and asthma attacks. It details the role of systemic oppression in siting polluting facilities in communities of color and calls for stricter EPA regulations and a transition to a clean energy economy.

The document argues that federal light-duty vehicle standards set by the EPA and NHTSA provide significant financial and environmental benefits to Pennsylvania, including $1.2 billion in savings to date and the projected creation of 26,400 new jobs by 2030.

The document details the health impacts of oil and gas air pollution in Pennsylvania, highlighting that 1.5 million people and over 1,300 schools are located within a half-mile of active operations. It reports that residents in eight counties around Pittsburgh face cancer risks exceeding EPA levels of concern and that over 30,000 children in the state suffer annual asthma attacks due to industry-linked ozone.

The City of Boulder implemented the 'Door to Downtown' (d2d) pilot program, offering $5 discounts on rides via Lyft, Uber, and zTrip to encourage the use of mobility services over personal vehicles. The program aims to address immediate parking challenges and test the long-term price elasticity of demand for Mobility as a Service (MaaS). By bringing the cost of rideshare services down to the estimated $0.60 per mile cost of owning and operating an internal-combustion vehicle, the pilot explores whether consumers will switch to shared mobility when it reaches cost parity with car ownership.

The document argues that strengthening local food systems increases resilience to climate-driven supply shocks. It recommends that cities protect agricultural land through zoning and greenbelts, embrace soil-free technologies like vertical farming, and promote redundancy through municipal composting and diversified water sources. It also suggests supporting the 'cottage food industry' and community food centres to enhance local resourcefulness and food security.

The document argues that proactive investment in climate resilience reduces long-term financial risks and liability costs for municipalities. It advocates for 'multiple-bottom-line' accounting and the valuation of ecosystem services (eco-asset accounting) to prioritize cost-effective natural infrastructure over expensive engineered solutions. The briefing details various financing mechanisms to enhance urban robustness, redundancy, and resourcefulness, including green bonds, public-private partnerships, user fees, and the use of Alberta's carbon levy. It concludes with strategic recommendations to embed resilience into zoning, permitting, and planning processes.

The document outlines a diverse landscape of climate financing for cities, categorised into local internal revenues, external third-party sources, and international funds. Local options include property and land taxes, user fees, development charges, and Tax Increment Financing (TIF), as well as 'intracting' for energy retrofits. External sources feature Energy Performance Contracting (EPC), green bonds, and crowdfunding. International support is available through climate funds like the Green Climate Fund (GCF) and Global Environment Facility (GEF), Multilateral Development Banks (MDBs), and philanthropic organisations, though the authors note that most international funds require cooperation with national governments due to strict fiduciary and creditworthiness standards. The guide emphasizes that while international funds are necessary for large-scale projects, local sources foster greater municipal autonomy and sustainability.

The guidelines establish a 'first green, then smart' approach, where smart technologies are used to optimize the outcomes of sustainable urban design. The framework covers six smart categories: telecommunications, mobility, governance, energy management, safety, and public services, supported by global case studies to demonstrate economic and environmental viability.

The report profiles ten U.S. cities where residents live in close proximity to petroleum refineries, documenting systemic exposure to toxic air pollutants, high rates of cancer and asthma, and frequent industrial accidents. It highlights a pattern of 'significant violation' of the Clean Air Act by major refineries and notes that these facilities are often located in low-income and minority neighborhoods. The document calls for the EPA to implement more stringent air toxics standards and improved fenceline monitoring to protect public health.

The report analyzes 52 tide gauges from Maine to Texas, projecting that by 2045, many U.S. East and Gulf Coast communities will face a ten-fold increase in tidal flooding. It argues that such flooding will disrupt daily life, damage infrastructure, and necessitate a coordinated national response combining local adaptation—such as elevating roads and restoring wetlands—with global carbon emission reductions.

Earthjustice sued the EPA for delaying standards to reduce toxic emissions from oil refineries, leading to a 2015 rule that introduced national fenceline monitoring for benzene and tighter controls on flaring and storage tanks. While the rule is estimated to reduce cancer risks for over one million Americans, Earthjustice and its partners argue the EPA underestimated community harm and failed to require real-time monitoring or prohibit routine flaring.

The briefing compares the climate of East Rutherford, New Jersey, with other NFL cities, noting that while it is a cold-weather venue for Super Bowl XLVIII, it is not the coldest in the league. It highlights historical Super Bowl temperature extremes and records the highest one-day snowfall in NFL cities, specifically noting Foxborough, MA. Additionally, it cites MIT research indicating that temperatures below 50°F negatively impact field goal accuracy more than wind or precipitation.

The report examines the transition of U.S. Navy bases in the Southwest toward microgrids to enhance energy security and integrate renewables. It identifies five key findings: the need for more granular design requirements, a conflict between utility-scale renewable goals and microgrid security, the immediate value of enhanced control systems, the complexities of participating in California's electricity markets, and internal Navy bureaucratic barriers. The document recommends that the Navy, grid operators, and regulators collaborate to define reliability needs, quantify the business case, and remove regulatory hurdles to enable microgrid adoption.

The analysis finds that EVs generally produce lower global warming emissions than average compact gasoline vehicles, though their relative performance against high-efficiency hybrids depends on the regional electricity grid's fuel mix. In 'BEST' regions, EVs outperform 50 mpg hybrids, while in 'GOOD' regions, some hybrids remain a better choice for emissions. Financially, EV owners in 50 major U.S. cities can save between $750 and $1,200 annually in fuel costs when using the lowest-cost electricity plans, with significant additional savings available through time-of-use (TOU) rate plans, particularly in California.

The report identifies a critical gap between climate science outputs and the operational needs of transportation practitioners. It argues that adaptation requires not only improved climate data—such as updated precipitation atlases and sea-level rise projections—but also a deep understanding of local non-climate factors like infrastructure elevation and soil saturation. The document emphasizes the need for a 'central clearinghouse' of information, better 'Climate-to-English' translation of scientific terms, and the integration of climate risk into existing asset management and budgeting processes. It highlights various pilot projects and tools, including the FHWA Risk Assessment Model and Toronto's Climate Change Risk Assessment Tool, as pathways toward increasing the adaptive capacity of transportation systems.

The report analyzes how global warming affects Pennsylvania's environment and economy, projecting severe risks under a higher-emissions scenario, such as the disappearance of snowmobiling, declines in dairy and fruit yields, and increased urban heat stress. It advocates for a transition to clean energy, citing Pennsylvania's role as the third-highest fossil fuel emitter in the U.S., and suggests specific adaptation strategies for infrastructure and natural resources.