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The document reports that 2021 was the 4th hottest year on record for the U.S., characterized by 20 billion-dollar disasters totaling $145 billion in damages. It highlights a long-term warming trend from 1970 to 2021 and a significant increase in the frequency of high-cost disasters compared to historical averages.

The report finds that all six analyzed historic sites in New Jersey currently face at least occasional flood risk, with four already experiencing chronic risk. Under the RCP scenario of unchecked emissions, all sites are projected to face at least frequent flood risk by 2050 and annual flood risk events by 2080. Specific sites like Barnegat Lighthouse and East Point Lighthouse are projected to experience chronic flood risk by the end of the century, with East Point potentially facing nearly monthly events.

Climate Central's analysis indicates that five historic sites in St. Augustine, Florida—Castillo de San Marcos, Fort Matanzas, Fort Mose, the Lightner Museum, and the Lincolnville District—are all projected to face chronic flood risk by the end of the century. Using the RCP 8.5 emissions scenario, the report finds that several sites already face substantial threats, with some experiencing frequent or chronic risk currently.

Analysis of 246 U.S. locations from 1970 to 2021 shows that 98% experienced an increase in average winter temperatures, with the Great Lakes and Northeast regions seeing the most significant warming. Winter is the fastest-warming season for 38 out of 49 states. While extreme cold events still occur, warming winters threaten regional economies through reduced snowpacks in the West, lower fruit yields, and the migration of disease-carrying pests.

Residential and commercial buildings contribute 13% of U.S. greenhouse gas emissions. The document highlights that adopting cost-effective efficiency and electrification measures can reduce carbon emissions of single-family homes by 24%, with the most significant savings coming from replacing inefficient furnaces and air conditioners with high-efficiency heat pumps.

The document argues that electrifying homes and businesses is a critical pathway to net-zero emissions, noting that these buildings account for 13% of U.S. greenhouse gas emissions. It highlights high-efficiency heat pumps, smart thermostats, and weatherization as key upgrades that can reduce emissions and lower utility bills. The brief emphasizes that while individual actions are important, systemic support through government incentives, building codes, and financing is necessary to overcome barriers, particularly for low-income households and renters in multifamily housing.

Climate Central analysis shows that 72% of 246 evaluated U.S. locations have seen an increase in the amount of rain falling on their annual wettest day since 1950, with the most significant increases occurring in the Gulf Coast and Mid-Atlantic. The document links these trends to rising temperatures, noting that for every 1°F increase, the atmosphere holds approximately 4% more moisture. It highlights the severe impacts of these events, including $43 billion in flood damages from 2016-2020 and disproportionate risks for Black, Brown, Indigenous, and poor communities, particularly in redlined areas where flood risk is 25% higher.

The authors used the delta method to reduce model biases by calculating monthly anomalies relative to a 1991-2020 reference period, then added observed averages from the Applied Climate Information System (ACIS) to derive absolute temperature values. They focused on two Shared Socioeconomic Pathways (SSP1-2.6 and SSP3-7.0) to represent low and high carbon emission scenarios, respectively, applying a rolling 10-year average to smooth the time series for 247 specific locations.

CoastalDEM v2.1 is a near-global digital elevation model (DEM) developed by Climate Central to provide more accurate land elevation data for coastal flood risk assessments. By utilizing a sophisticated convolutional neural network trained on NASA's ICESat-2 satellite lidar data, the model corrects the positive vertical bias common in satellite radar-derived DEMs, which often mistake building rooftops for ground level. Testing shows that CoastalDEM v2.1 virtually eliminates global median bias in the critical 0 to 5 m elevation band, significantly outperforming other publicly available global DEMs such as NASADEM, TanDEM-X, MERIT, and AW3D30, particularly in densely populated urban areas.

CoastalDEM v2.1 is a high-resolution global digital elevation model (DEM) designed to improve the accuracy of coastal flood and sea level rise assessments. By employing a convolutional neural network (CNN) trained on NASA's ICESat-2 satellite lidar data and using NASADEM as a base, it significantly reduces the positive vertical bias common in satellite radar DEMs, particularly in densely populated urban areas where buildings often distort elevation readings. Validation against ICESat-2 and airborne lidar data from the US and Australia indicates that CoastalDEM v2.1 outperforms other leading global models like TanDEM-X and MERIT, especially in the critical elevation band below 5 meters.

The document reports a rapid decline in Arctic sea ice, noting that the 15 lowest sea ice extents in the 42-year satellite record have all occurred in the last 15 years. It highlights the loss of multiyear ice and unprecedented melting events on the Greenland ice sheet in 2021. These changes are linked to global temperature rises and are projected to result in an effectively ice-free Arctic summer minimum at least once before 2050. The report details how this loss accelerates global warming via reduced reflectivity, disrupts jetstream-driven weather patterns, opens new shipping routes, and threatens the livelihoods of Indigenous communities.

Climate Central's analysis of weather station data from 225 locations across 17 U.S. states reveals a significant increase in fire weather days since the 1970s, driven primarily by warming and decreasing relative humidity. The report highlights that interior regions have seen higher increases than coastal areas, with some parts of New Mexico experiencing two additional months of fire weather compared to nearly 50 years ago. Beyond increasing wildfire risk, these conditions have led utilities like PG&E to implement public safety power shutoffs (PSPSs) to prevent equipment-related ignitions, resulting in significant economic impacts and health risks. The document argues that while land management and localized grids can mitigate risk, long-term stabilization requires reducing carbon pollution to net zero by 2050.

The document examines how rising temperatures and worsening air quality in Japan threaten the health and performance of Olympic and Paralympic athletes, specifically highlighting the risk of exertional heat stroke and the impact of ground-level ozone. It provides data on Tokyo's warming trend since 1964 and lists specific sports at high risk, such as the marathon and triathlon. Mitigation efforts include relocating the marathon to Sapporo, implementing the 'Tokyo 2020 Cooling Project', and athlete acclimatization.

Climate Central developed an Urban Heat Intensity Index for 159 U.S. cities, finding that New Orleans, Newark, New York City, Houston, and San Francisco have the highest intensity scores. The report identifies albedo, lack of greenery, population density, and building height as primary drivers of the UHI effect. These conditions exacerbate heat waves, worsen air quality through ground-level ozone formation, and disproportionately affect vulnerable populations, particularly those in formerly redlined neighborhoods. Proposed solutions include short-term emergency cooling measures and long-term infrastructure changes such as planting trees, installing green and cool roofs, and deploying solar energy.

The document describes the technical framework of WeatherPower v3.4, which uses a 0.05° grid of wind speed and solar irradiance data from MESO to estimate electricity generation. It details the integration of utility-scale and residential solar data (from EIA860, Tracking the Sun, and Project Sunroof) and wind turbine data (from USWTDB). The tool calculates primary metrics like electricity generated and indices (SPI and WPI), as well as comparative metrics such as CO2 emissions avoided and equivalent homes powered. A validation exercise using ERCOT data indicates that wind generation estimates are reasonably accurate, though on average about 10% higher than reported data.

The document examines the technological, economic, and environmental aspects of transitioning the U.S. transportation sector to electric vehicles. It highlights the role of falling battery costs, the necessity of expanding charging infrastructure, and the potential for significant public health improvements, particularly in marginalized communities. It also addresses challenges related to the sourcing of critical minerals like lithium and cobalt and the impact of regional climates on vehicle range.

The U.S. experienced significant growth in wind electricity generation between 2000 and 2020, with wind turbines accounting for 8.4% of total utility-scale electricity generation. Research from Net Zero America's 'High Electrification (E+)' scenario suggests that by 2050, Texas could lead the country with over 180 gigawatts of installed capacity, while Missouri, Iowa, Illinois, and Nebraska could each exceed 100 gigawatts. Offshore wind potential is particularly high along the East Coast, with Environment America estimating a potential for over 7,200 terawatt-hours of electricity per year. The document also highlights job growth potential, noting that Texas could support over 130,000 wind energy jobs by 2050, and rural states like Wyoming, Nebraska, Montana, and Iowa could see more than 200 jobs per 10,000 residents.

The document outlines the current state and future potential of onshore and offshore wind energy in the U.S. It details the economic benefits, including job growth and rural revenue, while addressing environmental impacts on wildlife. It specifically highlights the 'high electrification' scenario from Net-Zero America, projecting significant capacity increases and employment growth by 2050, particularly in states like Texas and the Midwest.

Climate Central's analysis indicates that a significant number of sites along the Harriet Tubman Underground Railroad Byway are currently or will become exposed to coastal flood risk by 2100. Under a high-emissions scenario (RCP 8.5), 16 locations will face at least occasional flood risk by 2050, increasing to 25 by the end of the century. Specific historic sites, including the Tubman Visitor Center and Malone's Church, are projected to experience chronic flood risk—defined as at least one event per year—by 2050 or 2060. The report also highlights risks to infrastructure, such as Taylors Island Road, and ecological threats to the Blackwater National Wildlife Refuge, where sea level rise may outpace sediment accumulation and drown habitats.

A warming climate is extending the seasons for pests like mosquitoes and ticks and increasing the efficiency of microorganism growth, leading to higher risks of infections and contamination of food and water.