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The report finds that anthropogenic climate change has significantly increased the probability of dangerous humid heat during the 2026 FIFA World Cup compared to 1994. Using Wet Bulb Globe Temperature (WBGT) as a metric, the analysis indicates that more games are expected to exceed the 26C and 28C thresholds recommended by FIFPRO for cooling breaks and postponement, respectively. While air-conditioned stadiums may mitigate risks for players, spectators at outdoor events remain vulnerable. The study concludes that without substantial adaptation and rapid mitigation of fossil fuel use, hosting summer tournaments in the northern hemisphere will become increasingly hazardous.

Analysis of USA National Phenology Network data shows that first spring leaves now emerge earlier in 88% of 242 major U.S. cities, shifting by an average of six days since 1981. This trend, combined with a freeze-free growing season that has stretched 21 days longer on average across 173 cities between 1970 and 2025, extends allergy seasons and increases the risk of 'false spring' crop losses. Ecological disruptions include potential mismatches between bird migration and the peak abundance of food sources.

Climate Central analysis of 221 marathons indicates that the probability of optimal, cool race-day temperatures is decreasing due to global warming. For recreational runners in the U.S., the current average chance of optimal temperatures is 27%, and this is projected to decline in 46 of 51 analyzed U.S. marathons by 2045 if high levels of heat-trapping pollution continue. The analysis highlights regional disparities, with the Northwest having the best current odds (55%) and the Southwest the worst (14%). Beyond performance, the document notes that rising heat and humidity increase risks of heat-related illness and that climate-driven air quality issues, such as wildfire smoke, further threaten runner health.

The report finds that 86% of analyzed global marathons will see a decline in the odds of optimal running conditions by 2045. While elite women are more resilient to heat, elite men are most affected, particularly at the Tokyo Marathon, which is projected to see the largest decline in ideal conditions among the Abbott World Marathon Majors. The analysis highlights that the 2025 Tokyo and Berlin Marathons experienced unusual heat made two to three times more likely by climate change. Shifting race start times to sunrise is identified as a potential adaptation to increase the likelihood of optimal temperatures for most runners.

Climate Central's analysis of 65 major U.S. cities reveals that approximately 76% of the 6.2 million K-12 public school students in these areas attend school in 'extreme urban heat zones,' where the built environment adds at least 8°F of additional heat. The average student in these cities attends school in a neighborhood that is 8.3°F hotter due to the built environment, with the highest average additional heat found in New York City (9.6°F). The report highlights that children are particularly vulnerable to heat-related health risks, which can impair academic achievement and development, while noting that 41% of public school districts need to update or replace HVAC systems in at least half of their schools.

The document outlines the drivers and impacts of sea-level rise, noting that global levels have risen 8-9 inches since 1880. It highlights the disproportionate risk to marginalized communities and older adults, explains the mechanics of 'compound flooding' and subsidence, and directs reporters to data tools from NOAA, the Permanent Service for Mean Sea Level, and the Nevada Geodetic Laboratory.

The guide explains that global sea levels have risen 8-9 inches since 1880, leading to more frequent coastal flooding. It highlights the disproportionate impact on elderly and marginalized communities and provides technical guidance on using NOAA data and understanding compound flooding and land subsidence.

The document argues that the market price of fossil fuels fails to account for significant 'hidden costs' or externalities occurring during extraction, transport, and combustion. It details the severe health impacts of coal mining, such as black lung and cardiovascular disease, and the environmental degradation caused by mountaintop removal in Appalachia. The paper also examines the risks of oil and gas drilling, including methane leakage, water contamination from fracking, and catastrophic spills. Finally, it quantifies the economic burden of air pollution and global warming emissions, contrasting these with the lower impacts of renewable energy sources.

The document details the history of transit inequality in Boston, specifically focusing on the Roxbury neighborhood, and outlines the advocacy work of Alternatives for Community and Environment (ACE) and the T Riders Union (TRU) to secure affordable, fair, and sustainable transit services.

The Union of Concerned Scientists (UCS) analysis indicates that reducing vehicle miles traveled (VMT) through increased transportation choices could save the U.S. up to $201 billion in energy infrastructure and $5.9 trillion in vehicle ownership costs by 2050. The report contends that current car dependence is driven by industry lobbying from the auto, fossil fuel, and road-building sectors, which receive over 75 percent of transportation spending. UCS recommends investing in diverse transportation networks, applying equity and climate lenses to project prioritization, and making planning processes more democratic to benefit the 30 percent of Americans who do not drive.

Climate Central analyzed the urban heat island (UHI) index across 65 major U.S. cities, finding that 68% of the 50 million residents in these cities live in areas where the built environment increases temperatures by 8°F or more. The study identifies albedo, green space, and population density as the primary drivers of this effect. It also highlights a link between historical redlining and current heat disparities, noting that in 84% of 179 analyzed cities, historically redlined areas experience hotter summers than non-redlined areas.

The document argues that climate change is a critical electoral issue in the 2024 US elections and urges journalists to move beyond 'red-blue' political binaries to report on the scientific consensus and local impacts. It provides specific questioning frameworks for candidates, methods for debunking common climate myths, and suggestions for localizing climate stories across sectors like infrastructure, housing, and energy. The guide emphasizes that reporting on the climate crisis is a matter of professional journalism rather than activism, citing the role of the press in holding power accountable during historical crises.

Analysis by Climate Central indicates that carbon pollution significantly increased the likelihood of abnormally warm winter days across the U.S. from December 2023 to February 2024. Approximately 85% of the U.S. population experienced at least one day where warm temperatures were at least twice as likely due to climate change. The Midwest experienced particularly strong climate fingerprints, with Minneapolis showing the largest warm departure from normal temperatures among 487 global cities with populations over 1 million. San Juan, Puerto Rico, recorded the highest number of days influenced by climate change at Climate Shift Index level 2 or higher.

Allston Brighton Community Development Corporation (CDC) is implementing deep energy retrofits (DER) at three residential properties in Boston to reduce energy consumption by an average of 55 percent across 103 units. By conducting portfolio-wide Capital Needs Assessments and leveraging a diverse stack of local and federal funding—including an expected $8 million in support—the CDC aims to eliminate on-site fossil fuel combustion and improve tenant well-being. The project utilizes guidance from RMI’s REALIZE-MA initiative and LISC’s 1000 Apartment Challenge to navigate the complex predevelopment phase and align with Massachusetts' climate goals and Boston's Building Energy Reduction and Disclosure Ordinance (BERDO).

The document argues that the U.S. transition to electric vehicles risks leaving behind low-income, rural, and minority communities due to 'charging deserts' and financial barriers. It outlines five strategies for local governments to ensure equitable access: utilizing community input for siting, prioritizing multifamily housing and charging deserts, expanding urban curbside charging, increasing pricing transparency, and supporting diverse e-mobility modes. The guide emphasizes that overcoming disparities in homeownership and energy burdens is essential for a just energy transition.

RMI organized Solarize cohorts in 2021 and 2022 involving 27 U.S. cities to make rooftop solar more accessible to low- and moderate-income (LMI) communities. By combining bulk purchasing discounts with grants and community partnerships, the program helped nearly 1,200 households install over 10 MW of residential solar, with 40% of participants from LMI or BIPOC communities. These installations are projected to save households over $8 million and avoid 106,000 tons of CO2 emissions over 25 years.

The document argues that Massachusetts can meet 100 percent of its electricity needs with renewable energy by 2035 through an aggressive build-out of wind, solar, and battery storage. This transition is projected to generate $1.7 billion in public health savings and $6.8 billion in net labor income by 2040. The analysis emphasizes the need for a just transition that prioritizes overburdened communities, provides support for fossil fuel workers, and ensures equitable access to clean energy technologies.

The document catalogues endorsements of the term 'climate emergency' across different sectors. It notes that nearly 14,000 scientists from 156 countries have signed a warning stating 'planet Earth is facing a climate emergency'. In the media, The Guardian updated its style guide to recommend terms like 'climate emergency, crisis or breakdown', and Noticias Telemundo adopted 'climate emergency' over 'climate change' in 2019. Politically, 23 national governments, including Japan, South Korea, New Zealand, and the European Union, have declared a climate emergency, alongside 2,060 towns, cities, and counties globally. Additionally, the UN Secretary General and Pope Francis have called for emergency declarations, and a 2021 poll indicated that two-thirds of the global population views climate change as a 'global emergency'.

The document advises US cities and communities to leverage existing federal funding opportunities to accelerate the clean energy transition. It highlights that the Biden Administration is integrating climate mitigation and racial equity into federal programs through initiatives like Justice40. The briefing recommends three strategies: understanding current funding landscapes via tools like the FFOLD tool, embedding environmental justice into project designs to increase competitiveness, and seeking funds from non-climate agencies such as those focused on health and economic development.

Cincinnati is developing a local electric transportation ecosystem involving the manufacturing of electric step vans by Workhorse and their adoption by Servall Electric. Servall is transitioning its fleet of 25 to 30 vehicles to electric and participating in the Run on Less – Electric (RoL-e) demonstration. The transition has resulted in a 75 percent reduction in daily fuel costs, dropping from approximately $60 for gas to $15 for electricity. Beyond financial savings, the electric trucks offer driver benefits such as 'one pedal driving' via regenerative braking and a lower vehicle architecture that reduces physical strain on drivers. The document also notes that urban last-mile delivery emissions in the top 100 global cities could increase by over 30 percent by 2030, reaching 25 million tons of CO2 annually.