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The briefing highlights a coastal sediment crisis in the Gulf of Mexico caused by human activity for the navigation industry. It outlines current state-level sediment efforts in Louisiana, Florida, Alabama, Texas, and Mississippi, and identifies the US Army Corps of Engineers (USACE) districts in Jacksonville, Mobile, and Galveston as regional leaders in RSM. To improve resilience, the author recommends that Congress reform the USACE 'federal standard' of least cost disposal, update Benefit-Cost-Ratio (BCR) calculations, support legislation like the Living Shorelines Act and Coastal Communities Adaptation Act, and shift toward sustained upfront federal investment rather than relying on post-storm funding.

The document explores nature-based solutions—such as wetlands, oyster reefs, and dune restoration—as alternatives or complements to traditional 'gray' infrastructure for mitigating storm surge, flooding, and erosion along the U.S. Gulf Coast. It highlights the role of regional partnerships like the Gulf of Mexico Alliance and the U.S. Fish and Wildlife Service's Coastal Program in implementing these strategies. A significant portion of the discussion focuses on the 'sediment crisis,' arguing for the beneficial use of dredged material to rebuild marshes and beaches. The panel concludes with legislative recommendations for the U.S. Congress, including reforming Army Corps of Engineers' cost-benefit ratios and funding pre-disaster mitigation.

The report finds that hundreds of American houses of worship face chronic flooding by 2050, with thousands more at risk by 2100 if emissions remain unchecked. It highlights the particular vulnerability of Gulf and Southeast coast states, specifically Louisiana, Florida, and North Carolina, while suggesting that deep emissions cuts and local adaptive measures could significantly reduce these risks. Additionally, it discusses the energy footprint of religious buildings and provides recommendations for improving energy efficiency and adopting renewable energy to mitigate climate change.

The policy memo outlines a framework for federal infrastructure investments in the United States, emphasizing the need to modernize the electric grid, accelerate offshore wind and battery storage, and implement 'climate-ready' design standards. It advocates for targeting investments toward underserved communities and displaced fossil fuel workers to ensure an equitable transition to a low-carbon economy.

The Union of Concerned Scientists (UCS) finds that over one-third of US nuclear plants are unprofitable or scheduled to close due to cheap natural gas and falling renewable costs. Without carbon-reduction policies, early retirements could increase US power sector emissions by 4% to 6% by 2035. The report recommends adopting carbon pricing or low-carbon electricity standards and conditioning any nuclear subsidies on strict safety performance and consumer protections.

The Union of Concerned Scientists (UCS) reports widespread PFAS contamination at US military bases, with many sites exceeding risk levels established by the Agency for Toxic Substances and Disease Registry (ATSDR). The document highlights the health risks of these 'forever chemicals', the history of industry disinformation, and the failure of the US military to transition to fluorine-free firefighting foams.

Climate Central's analysis of 244 U.S. cities reveals that 93% have seen an increase in cooling degree days and 87% have experienced more warm nights since 1970. The report highlights the role of urban heat islands and the increasing reliance on air conditioning, which costs Americans over $27 billion annually for home cooling as of 2015. While energy efficiency standards may reduce cooling electricity consumption by nearly 20% by 2040, the report warns that fossil-fuel-powered cooling and improper appliance disposal exacerbate climate change.

The document outlines the development of 'climate attribution' science, which allows researchers to quantify the role of human-caused climate change in extreme weather. It identifies that evidence is strongest for heat waves, coastal flooding, and extreme precipitation, while remaining less conclusive for tornadoes and thunderstorms. The text provides specific examples of US events, such as Hurricane Harvey and the February 2017 heat wave, where climate change significantly increased likelihood or intensity.

The report warns that sea level rise puts hundreds of thousands of US coastal properties at risk of chronic inundation, potentially leading to a collapse in real estate values and a significant erosion of local tax bases. Using a high sea level rise scenario, the analysis projects that by 2100, nearly 2.5 million properties valued at $1.07 trillion today will be at risk. The authors argue that current financial markets and government policies mask these risks, creating a 'narrowing window of opportunity' for communities to adapt. The report highlights particular vulnerabilities for low-income populations, the elderly, and specific states like Florida and New Jersey, while advocating for updated flood maps, transparent risk disclosure, and a shift away from subsidized insurance and disaster aid that encourages rebuilding in high-risk areas.

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 document analyzes the different approaches the U.S. and China take to overcome barriers to electric vehicle (EV) adoption, such as high upfront costs and limited charging infrastructure. While the U.S. relies on a mix of federal tax credits and varied state-level incentives, China has implemented more aggressive central government subsidies, a 'dual-credit policy' for manufacturers, and significant government fleet mandates. China's approach has led to faster growth in EV registrations and a larger network of charging outlets compared to the U.S.

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 analysis concludes that while Hurricane Harvey was an extremely rare event, global warming increased the intensity of its precipitation by approximately 15% and made such an event about three times more likely. Observational data and climate models indicate a trend of increasing extreme precipitation along the US Gulf Coast, often exceeding the standard Clausius-Clapeyron scaling. The study emphasizes that while the storm's rarity makes it difficult to attribute its existence to climate change, the increased rainfall intensity contributed significantly to the flooding in Houston, which was further exacerbated by urban development and subsidence.

The document argues that federal fuel economy and global warming emissions standards set by the EPA and NHTSA provide significant financial and environmental benefits to Louisiana. It claims that by 2030, the average Louisiana household will be $3,200 richer due to gas savings outweighing the upfront cost of more efficient vehicles. To date, Louisiana has saved $530 million, and the state is expected to see 2,200 new jobs. Environmentally, the standards eliminate global warming emissions in Louisiana equivalent to half of those produced by providing electricity to New Orleans.

The Union of Concerned Scientists (UCS) warns that many Louisiana communities face 'chronic inundation'—defined as high tide flooding 10% or more of usable, non-wetland area at least 26 times per year—within the coming decades. Under an intermediate sea level rise scenario, 95 southern Louisiana communities will face this by 2035, increasing to 131 by 2100. In the high scenario, some areas, including all communities in Lafourche and Terrebonne Parishes, could see 90 to 100 percent of their land area chronically inundated by the end of the century. The report argues for a science-based approach to adaptation, including updating flood risk maps, reforming insurance, and creating programs for retreat and relocation.

The Union of Concerned Scientists (UCS) identifies numerous Maryland communities, particularly on the Eastern Shore, at risk of chronic inundation—defined as high tide flooding 10% or more of usable non-wetland area at least 26 times per year. Under an intermediate sea level rise scenario, 22 communities will face this by 2035 and 17 more by 2100, with some areas like Crisfield facing flooding of over half its land area within 20 years. The report emphasizes that limiting global warming could spare between 9 and 31 communities from chronic inundation by the end of the century and calls for updated flood maps, reformed insurance, and funded relocation programs.

The Union of Concerned Scientists (UCS) identifies significant risks of chronic inundation for New Jersey coastal communities, with 21 communities expected to be affected by 2035 under an intermediate scenario and over 100 by 2100. The report highlights that major metropolitan areas like Newark and Elizabeth face substantial land loss by 2100 and suggests that limiting global warming to 1.8°C could spare dozens of communities from this fate. To address these risks, UCS advocates for phasing out risky coastal development, enhancing disaster response funding, and creating new policies for managed retreat and relocation.

Plaquemines Parish faces extreme risks from relative sea level rise and land subsidence, which is exacerbated by oil and gas operations and upstream flood control. The region has lost 2,300 square miles of wetlands since 1932, leaving communities vulnerable to storm surges and flooding. Predominantly Black communities, such as Ironton and Woodland, experience a confluence of socioeconomic vulnerability and pollution from refineries and coal terminals. While Louisiana's 2012 Comprehensive Master Plan for a Sustainable Coast proposes a $50 billion investment in defenses like the Mid-Barataria Sediment Diversion, critics argue the plan may use inadequate sea level rise projections and fail to protect all communities. Local residents emphasize the need for equitable resource distribution and local employment in restoration projects to ensure communities are made whole.

The analysis concludes that human-caused climate change increased the frequency of extreme three-day precipitation events like the August 2016 Louisiana downpours by at least 40% and increased their intensity by approximately 10%. Using observational data and high-resolution climate models (FLOR-FA and HiFLOR), the study found that such events are now more likely and intense than they were in 1900. While the specific local event was characterized as a 1-in-550 year occurrence, similar events now occur somewhere along the Central U.S. Gulf Coast region approximately once every 30 years.

The report finds that 238 US counties in 21 states face cancer risks exceeding the EPA's 1-in-a-million threshold due to oil and gas emissions, affecting over 9 million people. Key pollutants identified include benzene, formaldehyde, and ethylbenzene, with the highest risks concentrated in states with significant infrastructure like Texas, Louisiana, Oklahoma, North Dakota, Pennsylvania, and Colorado. The analysis highlights that NATA likely underestimates total health impacts by excluding particulate matter, ozone, and water contamination. To mitigate these risks, the report recommends implementing leak detection and repair (LDAR) programs, replacing high-emitting pneumatic equipment, and installing vapor recovery units on storage tanks.