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The Union of Concerned Scientists finds that under current policies, Louisiana will meet increased electricity demand from data centers using gas-fired generation, leading to significant costs for ratepayers and environmental damage. Between 2026 and 2041, cumulative electricity system costs attributed to data center growth are projected to be between $14 billion and $26 billion. The analysis further estimates that electricity generation for data centers will result in $1.5 billion to $3.0 billion in public health costs and $35 billion to $87 billion in climate damages by 2041. The report urges the Louisiana Public Service Commission to reform resource planning, ensure technology companies pay for the costs of new demand, and diversify the energy mix with non-fossil resources.

The document outlines a comprehensive approach for scientists to navigate the risks associated with public engagement, particularly in contexts of democratic backsliding. It provides a quantitative risk assessment tool based on demographics, history, and institutional factors, and offers specific guidance on digital hygiene, managing public records under FOIA and state laws, and preparing for harassment. The guide emphasizes the importance of maintaining a distinction between personal and professional roles and building support networks to safeguard researchers who challenge government failures in science-based policymaking.

The document is a comprehensive glossary designed to bridge the communication gap between the scientific and legal communities in the context of climate litigation. It defines key terms across seven thematic areas: foundational scientific concepts, measurement and data methods, climate and environmental science, risk and impact, public health, Indigenous Knowledge, and socioeconomic policy. The guide emphasizes the distinctions between scientific and legal interpretations of terms like 'bias', 'significance', and 'uncertainty', and explains how attribution science and climate modeling can be used to establish causation and responsibility in court.

The Union of Concerned Scientists reports that the Trump administration has granted Clean Air Act exemptions to over one-third of 546 eligible industrial facilities, including coal plants and chemical manufacturers. This policy affects nearly 4.6 million people and over 4,300 schools and daycares, with a disproportionate impact on communities already facing high environmental and social stressors. The administration utilized a national emergency provision in March 2025 to allow a two-year exemption, which the EPA intends to make permanent.

The report estimates that US farmers apply 30% to 50% more synthetic nitrogen fertilizer than crops can absorb, contributing to significant greenhouse gas emissions. It calculates total US fertilizer-related emissions at approximately 120 million metric tons of CO2 equivalent, with direct nitrous oxide emissions accounting for nearly 40% of this total. The document also analyzes the impact of USDA's Conservation Stewardship Program (CSP) and Environmental Quality Incentives Program (EQIP), specifically Nutrient Management Practice 590, arguing that increased funding for these programs can reduce fertilizer dependency and generate economic benefits for farmers and the broader economy.

The report finds that US farmers apply 3.5 to 5.8 million metric tons of nitrogen fertilizer in excess of what crops can absorb, contributing to significant greenhouse gas emissions and water pollution. It highlights that nitrogen fertilizer use in 2023 was responsible for approximately 120 million metric tons of CO2 equivalent emissions. The authors argue that voluntary USDA programs like EQIP and CSP are underfunded and that the next Farm Bill should prioritize soil health and agroecology to reduce chemical dependency and climate risks.

The document highlights that US farmers apply 30 to 50 percent more synthetic nitrogen fertilizer than crops can absorb, leading to significant economic waste and greenhouse gas emissions. It advocates for the next food and farm bill to increase funding for USDA programs like EQIP and CSP to support soil health and climate resilience, particularly for socially disadvantaged farmers.

An analysis of the winter 2024–2025 season indicates that offshore wind projects could significantly lower the risk of power outages in New England by offsetting high electricity demand during cold spells. A 1,500 MW fleet would have reduced the risk of energy shortfalls by 55%, while a 3,500 MW fleet would have reduced it by 79%. Such a transition to local renewable resources would decrease reliance on volatile imported LNG and lower wholesale electricity prices, potentially saving consumers $400 million.

The document details the use of a modified Regional Energy Deployment System (ReEDS) model to project US electricity demand from data centers and the resulting effects on the energy transition. It outlines five demand scenarios, including 'high data center demand growth', and evaluates them against various policy frameworks such as the Inflation Reduction Act (IRA) and the One Big Beautiful Bill Act (OBBBA). The analysis incorporates specific state-level emissions caps for Illinois, Michigan, and Wisconsin, and adjusts technology costs for nuclear and carbon capture and storage (CCS) to reflect conservative estimates. It also details the calculation of health damages from criteria pollutants and the social cost of greenhouse gas emissions.

The Union of Concerned Scientists analysis finds that data center load growth could increase Illinois electricity system costs by $24 billion to $37 billion by 2050 and drive the state to become an energy importer as early as 2030. Under current policies, this growth would increase reliance on in-state fossil fuel plants and out-of-state imports, leading to higher CO2, methane, NOx, and SO2 emissions. The report estimates that this growth could cause between 68 and 403 additional mortalities and up to $124 billion in climate damages by 2050. To mitigate these effects, the document recommends requiring data centers to secure new carbon-free electricity resources, increasing transparency in power reporting, and restoring federal clean energy tax credits.

The Union of Concerned Scientists analysis finds that Michigan's electricity demand could nearly double by 2050, driven significantly by AI-related data centers. While current policies may lead to increased fossil gas capacity and emissions due to an energy export loophole, a proposed CO2 reduction policy could enable Michigan to meet 95% of its 2050 demand with renewables and low-carbon sources, avoiding $3.5 billion in local health costs and $408 billion in global climate damages.

The report argues that the United States can meet surging electricity demand from AI data centers using clean energy while phasing out fossil fuels, provided that stronger state and federal policies are implemented. It warns that under current policies, data center growth will increase reliance on gas and coal, leading to higher emissions and significant costs for ratepayers. Conversely, adopting clean energy policies—such as restoring federal tax credits and implementing carbon-free electricity standards—could save trillions of dollars in climate and health damages, far outweighing the costs of the energy transition.

The report finds that data centers are the primary driver of near-term electricity demand growth in Wisconsin, which risks increasing reliance on fossil fuels under current policies. By implementing a Clean Electricity Standard and CO2 reduction policies, Wisconsin could generate 83% of its electricity from clean energy by 2050 and reach net-zero CO2 emissions. Such policies would avoid significant health-related costs and mortalities compared to current trajectories. The report recommends reintroducing Integrated Resource Planning and establishing a clean electricity standard to protect ratepayers and the climate.

The document highlights the role of vehicle-grid integration (VGI) and bidirectional charging in supporting California's transition to a clean grid. It notes that while the state requires massive investments in new energy resources and transmission to meet the 100 Percent Clean Energy Act (SB 100) targets, the use of electric vehicle (EV) batteries as energy storage can lower these costs. Specifically, it suggests that 50 percent V2G enrollment could save over $10 billion annually in grid costs by 2045.

The report analyzes power outage data from 2014 to 2024 in the central United States, specifically the MISO+ region, finding that all of the 100 worst outage days were caused by extreme weather. It highlights that the 10 most severe events occurred after 2020 and were often compound disasters, such as hurricanes combined with flooding or winter storms with tornadoes. The document argues that climate change is intensifying these risks—increasing the frequency of derechos, the rainfall of hurricanes, and the potential for severe winter outbreaks—while disproportionately impacting socially vulnerable communities. It recommends that utilities, states, and regional operators implement comprehensive climate risk assessments, accelerate the clean energy transition, and engage in meaningful community partnership to build a resilient grid.

The 2025 East Asia Quadrilateral Dialogue joint statement argues that geopolitical zero-sum thinking and great power competition increase the risk of military conflict in East Asia and hinder cooperation on the climate crisis. The signatories advocate for the institutionalization of Track II diplomacy—linking civil society, parliaments, and experts—to maintain peace and manage regional competition.

The Union of Concerned Scientists analyzed nearly eight million affordable homes and found that 79.1% were located in counties experiencing at least one week's worth of heat alerts in 2024. The report highlights that people of color, older adults, and individuals with disabilities are disproportionately affected due to substandard housing, the urban heat island effect, and energy insecurity. Key recommendations include increasing funding for the Low-Income Home Energy Assistance Program (LIHEAP), implementing cooling inspection standards for subsidized homes, and updating building codes to improve heat resilience.

The Union of Concerned Scientists analyzed the intersection of the housing crisis and extreme heat, finding that residents of affordable housing—particularly people of color, older adults, and people with disabilities—face significant risks. Analysis of 2024 heat alerts shows that the highest shares of exposed affordable housing are in the Northeast and Southeast, while Texas, California, and New York have the highest total number of exposed homes. The report advocates for increased investment in climate-resilient affordable housing and the expansion of the Low-Income Home Energy Assistance Program to improve cooling and building efficiency.

The Union of Concerned Scientists and a broad coalition of experts argue that the EPA's proposal to repeal the 2009 Endangerment Finding is contrary to scientific evidence and the public interest. They assert that human-caused climate change is indisputable and causes severe harms to public health, the economy, and the environment. The authors specifically criticize the EPA's reliance on a Department of Energy report they describe as unscientific and inaccurate, while urging the agency to maintain regulations on heat-trapping emissions to meet global climate goals.

The report identifies 'electoral cumulative inequalities' where precincts with majority populations of color consistently exhibit lower voter turnout and higher ballot rejection rates compared to majority-White precincts. Analyzing data from battleground counties in Arizona, Georgia, Michigan, North Carolina, Ohio, Pennsylvania, and Wisconsin, the authors argue that these disparities are systemic and not solely explained by state-level factors. The study highlights that communities with the lowest turnout also face the highest rates of ballot rejections, further diminishing their political representation. The authors advocate for more equitable ballot design and increased election data transparency to mitigate these inequities.