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Climate Change Raises Rates of U.S. Emergency Room Visits For Heat Illness
New research from Climate Central indicates that climate change accounted for 27% of the rate of heat-related emergency room visits in the U.S. during the warm seasons from 2018 to 2025. The study found that all U.S. regions experienced increased visit rates due to climate change, with the highest rates occurring in southern and western states. A notable peak occurred during the June 2021 northwestern U.S. heat wave, where daily visit rates were approximately 50 times higher than the regional average, with 27% of that rate attributed to climate change.
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Document type: Research paper
Next-Generation Geothermal at Scale: A State Action Framework
The report argues that while next-generation geothermal has vast potential to provide clean firm power, its growth is hindered by a 'missing middle' financing gap, subsurface uncertainty, and outdated regulatory frameworks. It proposes five deployment levers: characterizing subsurface resources through data digitization and mapping, governing through streamlined permitting and clarified property rights, financing via procurement standards and convertible loans, connecting through improved transmission planning and workforce development, and innovating through sustained R&D and testbeds.
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Document type: Report
Climate Change Raises Rates of U.S. Emergency Room Visits For Heat Illness
Climate change accounted for 27% of the rate of heat-related emergency room visits in the U.S. during 2018-2025. August 2026 was the warmest August on record globally, with record warmth affecting 13.2% of global land and ocean areas. In the U.S., Summer 2026 was the warmest on record for the contiguous region, and August 2026 was the warmest August for average, maximum, and minimum temperatures since 1895. Drought affected at least 81% of the contiguous U.S. as of September 8, 2026, and nearly 8.3 million acres burned year-to-date, driven by increased 'fire weather' days. Attribution analysis using the Climate Shift Index (CSI) indicates human-caused climate change drove summertime warming trends in 91% of analyzed U.S. cities. Additionally, a strong El Niño event is projected to peak around February 2027, with global temperature anomalies potentially reaching 1.7C above pre-industrial levels.
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Document type: Briefing
Compassus: Private equity’s joint venture playbook
The document analyzes the growth of Compassus, a for-profit home-based care provider jointly owned by TowerBrook Capital Partners and Ascension Health, as a model for private equity expansion into nonprofit healthcare. It details joint ventures with systems including Providence, Bon Secours Mercy Health, and OhioHealth, highlighting the strategic shift toward home-based care. The text specifically examines the Providence partnership, noting that while Providence sought to reduce operating losses and manage services outside its 'core focus', the move faced opposition from nursing associations over concerns regarding patient care quality, workforce benefits, and access for underserved populations.
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Document type: Case study
LNG: Japan’s new export
Japan has become a major global LNG trader, significantly increasing its resales of US-sourced LNG to Asian markets between 2021 and 2025. This trade pattern, supported by Japanese government initiatives and financing, contributes to substantial lifecycle greenhouse gas emissions. The analysis shows that 16.5 billion kg of US LNG resold by Japan to Asia released 63.5 billion kg of CO2, with methane leaks and combustion being the primary drivers. The document argues that promoting LNG infrastructure in Asia risks locking in fossil fuel dependence and exacerbating climate-induced disasters in a region already vulnerable to extreme weather.
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Document type: Briefing
Climate Central’s Monthly Briefing Highlights from June 2026
June 2026 was the second-warmest June on record globally, with the Arctic experiencing its warmest June ever. In the U.S., 66% of the contiguous region faced abnormally dry or drought conditions by July 7, 2026, and the West and Southwest regions saw their warmest January-June period on record. A very strong El Niño is forecast to develop between October and December 2026, with an 81% probability, likely pushing global temperatures to or above 1.5C by October. Climate Central's analysis indicates human-caused climate change is a key driver of summertime warming in 91% of analyzed U.S. cities.
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Document type: Briefing
Monthly Climate Reports | National Climate Report | May 2026
The May 2026 report highlights that the month was the second-warmest on record globally, with carbon dioxide levels reaching a new monthly peak of 432.3 ppm. In the United States, spring 2026 was the second-warmest on record for the contiguous U.S., while 77% of the region experienced abnormally dry or drought conditions as of early June. The report also notes a developing potentially very strong El Niño and record-low snowpack in several western states.
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Document type: Briefing
Extreme Precipitation in a Warming Climate
Analysis of 144 U.S. cities shows that 90% have experienced increased hourly rainfall intensity since 1970, with the highest average increases in the Upper Midwest. Projections indicate that at 2°C of global warming, 85% of U.S. counties will likely see a 10% or higher increase in precipitation on the heaviest 1% of days, with disproportionate risks for Black communities and rural areas.
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Document type: Fact sheet
Comment in Support of HB5000 (Health Facilities Planning.)
The Private Equity Stakeholder Project supports Illinois HB5000, arguing that private equity's expansion into healthcare—through leveraged buyouts, roll-ups, and joint ventures—often leads to higher prices, increased debt, and reduced quality of care. The document details specific financial tactics like sale-leasebacks and dividend recapitalizations, and highlights the growth of private equity in ambulatory surgery centers and physician practice management, urging regulators to increase oversight to protect patient access and cost.
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Document type: Statement
Fastest-Warming U.S. States and Cities
April 2026 was the fourth-warmest month globally on record, with the contiguous U.S. experiencing its third-warmest April. The report highlights severe drought in the Southeast U.S., record-low Western snowpack, and a persistent marine heat wave off the coasts of California and Mexico. Using the Climate Shift Index (CSI), the analysis attributes springtime warming trends in 98% of analyzed U.S. cities to human-caused climate change, with exceptional warmth noted in Honolulu and San Juan. Forecasts indicate a high probability of a strong El Niño developing later in 2026, potentially driving global temperature anomalies above 1.8°C relative to pre-industrial levels by early 2027.
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Document type: Briefing
Record Snow Drought Limits Western Water Supplies
March 2026 was the warmest March on record for the contiguous U.S., characterized by a historic snow drought in the West and extreme heat that increased cooling energy demand. Globally, the month was the second-warmest on record, with Arctic sea-ice reaching a near-record low maximum. In the U.S., severe drought affected 77% of the contiguous region, while Hawaii experienced record-breaking precipitation due to Kona lows.
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Document type: Briefing
Climate Change is Disrupting Air Travel
The document details how climate change disrupts U.S. transportation systems through acute events like hurricanes and chronic stressors like sea level rise. It highlights significant projected costs for asphalt maintenance and railroad delays, the vulnerability of coastal highways and bridges, and the necessity of proactive adaptation, such as using heat-resistant materials and nature-based solutions, to mitigate economic losses.
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Document type: Policy brief
Private equity lags stocks for retail investors
A review of fifteen large private equity evergreen funds reveals they significantly underperformed the S&P 500 and MSCI ACWI indexes in 2025 and over a three-year period, despite charging median expense ratios of 3.76% compared to 0.03% for the Vanguard S&P 500 ETF. The report notes that the private equity industry is seeking a regulatory safe harbor from the US Department of Labor to limit lawsuits as it targets 401K retirement savings, a shift occurring as global fundraising fell 11.0% in 2025 and several US state pension funds—including those in Alaska, Texas, and Ohio—reduced their private equity allocations due to dwindling returns and liquidity risks.
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Document type: Report
Monthly Attribution Overview – December 2025
The report finds that while December 2025 temperatures in the U.S. were evenly split between warmer-than-average and cooler-than-average cities, long-term trends show nearly all analyzed cities have warmed since 1970. The Southwest was the most unusually hot region, with Casper, Wyoming, recording the highest anomaly. Climate signal (CSI) was minimal nationwide, though San Juan, Puerto Rico, saw 10 days where temperatures were at least five times more likely due to climate change.
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Document type: Report
Climate Central’s Monthly Briefing Highlights from January 2026
January 2026 was the fifth-warmest January on record globally, characterized by significant temperature anomalies in the U.S. West and record-low snowpacks in several states. The document highlights the transition of NOAA to the Relative Oceanic Niño Index (RONI) to better account for climate change in ENSO tracking. Attribution analysis using the Climate Shift Index (CSI) indicates that extreme warmth in the northern U.S. and specific cities like San Juan and Honolulu was strongly driven by carbon pollution.
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Document type: Briefing
Clean Energy 101: Renewably Powered Minigrids
The document defines renewably powered minigrids (or microgrids) as systems combining renewable energy sources, battery storage, and sometimes backup generators to provide power to communities or specific facilities. It details three configurations: isolated, undergrid, and interconnected. Case studies illustrate their use in the Caribbean for hurricane resilience, in Africa for expanding business and home energy access, and in the United States for reducing diesel reliance in remote areas and enhancing military facility resilience.
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Document type: Fact sheet
State-Level Climate Security Education: Colorado
Colorado is experiencing a rise in billion-dollar climate disasters, with an increase from 1.7 annually since 1980 to 4.4 per year between 2020 and 2024. The state faces critical threats from wildfires, flooding, avalanches, and drought, which impact public health, infrastructure, and the economy. Federal agencies including NOAA and FEMA provide essential forecasting, research, and funding for mitigation, such as the $13.8 million BRIC grant for the Greely Water Pipeline. However, proposed FY26 budget cuts and the cancellation of programs like BRIC threaten to shutter research labs in Boulder, eliminate cooperative university partnerships, and reduce funding for climate-smart agriculture and critical mineral surveys, potentially increasing the vulnerability of both local communities and military installations such as Buckley Space Force Base and Fort Carson.
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Document type: Research paper
2025 in Review: U.S. Temperatures
In 2025, the contiguous U.S. experienced its fourth-warmest year on record and 23 billion-dollar weather and climate disasters, totaling $115 billion in damages. Globally, 2025 was the third-warmest year since 1850, with NOAA data indicating it was approximately 1.3°C warmer than the pre-industrial average. The year was marked by record-breaking December heat in the U.S. Southwest and devastating atmospheric river flooding in Washington and Oregon.
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Document type: Briefing
2025 Winter Package
The document reports that November 2025 was the third warmest on record globally and the fourth warmest for the contiguous U.S. It highlights a long-term trend of warming winters in the U.S., where the coldest day of the year has warmed by approximately 7°F since 1970. The briefing also notes significant regional anomalies, such as extreme warmth in Texas and heavy rainfall in southern California, while discussing the ongoing La Niña advisory and its expected impacts on weather patterns through early 2026.
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Document type: Briefing
Fastest-Warming Seasons
Analysis of 244 U.S. cities shows that winters are the fastest-warming season for most of the country, with average temperatures increasing by 3.9°F since 1970. This trend is characterized by fewer freezing nights, shorter cold streaks, and a significant increase in warmer-than-normal winter days, particularly in the Northeast and Upper Midwest. These changes threaten mountain snowpack, crop yields for the $27 billion fruit and nut industry, and the winter recreation economy, while potentially increasing pest-related health risks and allergy durations.
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Document type: Fact sheet