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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.

Analysis of 243 to 247 major U.S. cities reveals that 95% have seen an increase in unusually warm summer nights since 1970, with an average increase of 24 nights per summer. Using the Climate Shift Index (CSI), the report finds that human-caused climate change now strongly influences an average of 27 warm summer nights per year, compared to just one in the 1970s. The most severe impacts are concentrated in Florida and Puerto Rico, where some cities experience over two months of climate-driven warm nights annually. These trends exacerbate heat stress, disrupt sleep, and increase energy demand for air conditioning, disproportionately affecting vulnerable populations and those in urban heat islands.

Analysis of cooling degree days (CDD) shows that 97% of 241 major U.S. cities experienced increased cooling demand since 1970, with an average increase of 37%. This trend, combined with a 31% rise in residential electricity prices between 2020 and 2025, increases the financial burden on households, particularly low-income families. In 2020, the ten states with the highest cooling costs saw average household expenditures between $378 in Hawaii and $712 in Arizona. Future projections suggest U.S. household cooling demand will rise 43% by 2050. The report also highlights systemic risks, including electricity grid strain, increased carbon emissions from fossil-fuel-reliant cooling, and the urban heat island effect caused by waste heat from air conditioners.

The author contends that treating the reduction of greenhouse gas emissions and the implementation of heat adaptation measures as a zero-sum game is a dangerous fallacy. While some argue that adaptation (such as air conditioning) should be prioritized over mitigation, and others express concern that cooling technologies exacerbate heat, the document asserts that both are essential. It highlights that failing to reduce emissions increases the future burden of adaptation, while failing to adapt leads to immediate loss of life, citing the 2021 heat dome in British Columbia. The proposed solution is the rapid expansion of a clean, affordable, and flexible electrical grid to power modern cooling technologies like heat pumps, combined with long-term urban planning such as improved insulation and increased tree canopy.

The author contends that treating the need for immediate heat adaptation and the long-term goal of reducing emissions as a trade-off is a 'dangerous false choice.' While some argue that focusing on emissions neglects immediate safety, and others suggest air conditioning worsens heatwaves, the document asserts that both are necessary. It argues that the solution lies in decarbonizing the electricity grid to provide clean, affordable power for cooling, while simultaneously improving home insulation and urban shading to reduce energy demand.

Climate Central's analysis reveals that the average person globally lost nearly 56 hours of sleep annually due to nighttime heat from 2020 to 2025, with approximately six hours attributed to climate change. The most significant climate-linked sleep losses occurred in Middle Eastern cities, where residents in Saudi Arabia, Oman, and the UAE lost between 12 and 16 hours of sleep per year due to climate change. Globally, the amount of temperature-related sleep loss linked to climate change has at least doubled since the early 1970s, increasing from about two hours to five hours per year. Vulnerable populations, including adults over 65 and those in lower-middle-income countries, face higher risks, and while air conditioning provides some protection, access remains unequal and tied to income.

Climate Central analysis reveals that residents in 65 of the largest U.S. cities experience an average of 8°F of additional heat due to the built environment. The document details mitigation strategies including green space, shade structures, water features, and cool pavements/roofs, while highlighting that heat exposure is disproportionately higher in historically redlined areas and low-income neighborhoods.

The report analyzes a severe heatwave in July 2026 characterized by record-shattering Wet Bulb Globe Temperature (WBGT) values across the eastern US and Canada. Attribution analysis indicates that while the atmospheric circulation pattern (a 'heat dome') is characteristic of the region, the intensity of the event was substantially increased by a background climate that has warmed by 1.4°C due to fossil fuel combustion. The study emphasizes that humid heat extremes are an emerging risk, as WBGT is increasing more rapidly than absolute maximum or minimum temperatures. It also highlights the disproportionate vulnerability of low-income residents, outdoor workers, and those in historically redlined urban districts, while noting the critical role of heat action plans and cooling centers in mitigating mortality.

The document highlights the disproportionate risk extreme heat poses to the global workforce, noting that over 70% of workers are at risk and 19,000 die annually. In the US, outdoor workers—primarily Black and Latino—face a death rate 35 times higher than the general population, yet 43 states lack comprehensive heat standards and federal rules have stalled. The guide suggests investigating local heat action plans and interviewing affected workers, while referencing specific risks like chronic kidney disease in India and the use of wet bulb temperature for monitoring.

The June 2026 heatwave in Western Europe is the most severe ever recorded for the region, with temperatures 5–12°C above seasonal averages. Analysis shows that such an event would have been virtually impossible in 1976 and significantly rarer in 2003, indicating that extreme heat is increasing rapidly due to global warming. The event caused widespread disruption to transport, energy systems, and health services, with 45% of European cities breaking indoor Wet Bulb Globe Temperature (WBGT) thresholds.

The study finds that anthropogenic climate change approximately tripled the probability of the April 2026 heatwave in northwestern India and Pakistan, making it about 1°C hotter than it would have been in a preindustrial climate. Analysis indicates that extreme heat is occurring earlier in the season, with the likelihood and intensity of April events increasing more rapidly than those in May. This trend extends the period of dangerous heat exposure for hundreds of millions of people, compounding risks to health, agriculture, and the economy. The report also highlights systemic vulnerabilities, noting that heatwaves are not officially declared disasters in India and Pakistan, which limits access to relief funding.

The document highlights the health risks posed by extreme heat to players, workers, and fans during the 2026 World Cup, noting that cities like Monterrey, Dallas, and Miami could exceed 35 °C. It discusses FIFA's implementation of three-minute hydration breaks and the potential for shifting match structures to four quarters. Additionally, it addresses the environmental impact of the tournament, specifically the high pollution levels resulting from travel across three host countries, and links these temperature increases to the burning of fossil fuels.

The document argues that climate change increases violence by exacerbating risk factors such as extreme heat, resource scarcity, and material insecurity. It highlights specific links between rising temperatures and intimate partner violence, gun violence, and group-level conflict, while advising reporters to use granular data and center marginalized voices to illustrate these social climate impacts.

The project aims to reduce urban climate vulnerabilities in Ethiopia through a combination of national policy frameworks, city-level Nature-based Solutions (NbS), and sustainable financing. In Addis Ababa, interventions focus on the Jemo-Harbu River corridor, including reforestation of Jemo Mountain, riverbank stabilization, and the creation of green canopies to mitigate heat and flood risks. In Jimma, the project targets the Awetu River catchment through reforestation, agroforestry, and wetland rehabilitation. Nationally, it establishes an Inter-Sectoral Coordination Committee and a knowledge portal to mainstream NbS into urban planning. The initiative is supported by a total of USD 47 million, with USD 25 million from the Green Climate Fund and USD 22 million from KOICA, targeting a total of 1,780,947 direct and indirect beneficiaries.

The SUNCASA project has implemented nature-based solutions (NbS) across three Sub-Saharan African cities, planting 2.4 million trees and shrubs and restoring over 3,500 hectares of land within its first two years. In Dire Dawa, the project focuses on afforestation and agroforestry to combat soil erosion and improve food security. In Kigali, efforts center on riparian buffer zones and agroforestry to reduce flood risks. Johannesburg's primary focus is the removal of alien invasive species to protect water quality and biodiversity. The project integrates gender equality and social inclusion (GESI) to ensure marginalized groups participate in climate adaptation. Cost-benefit analyses indicate significant future savings in flood-related infrastructure and health expenses across all three cities.

The report details the disproportionate burden of climate change on Africa, noting that since 1984, the continent has faced 1,865 climate-related disasters resulting in US$53 billion in losses. It highlights a critical lack of financial protection, with only 9% of disaster losses insured. Regional analysis shows water-related disasters as the primary threat, with severe flooding in East Africa and historic droughts in Southern Africa and the Horn of Africa. The document also links climate change to the spread of diseases like cholera and malaria, and the risk of desertification in the Sahel and West Africa.

The report analyzes a record-shattering heatwave in the southwestern United States and northern Mexico in March 2026, finding that such an event would have been virtually impossible without anthropogenic climate change. Using a combination of observation-based data and climate models, the study estimates that the intensity of 1-in-100-year March heat events has increased by 2.6°C and their likelihood has increased by a factor of approximately 800. The document highlights the extreme vulnerability of non-acclimatized populations and the risk of accelerated snowmelt in the Sierra Nevada and Colorado mountains.

Between December 2025 and February 2026, climate change significantly boosted global temperatures, with over one in six people experiencing strong climate influence daily. Nearly 228 million people faced 30 or more risky heat days added by climate change, with 81% of these individuals residing in Africa. The analysis highlights that in 45 countries, all risky heat days during this period were driven by climate change, and 124 countries saw the average person experience at least 30 days of strong climate influence (CSI level 2 or higher).

The assessment evaluates the viability of nature-based solutions (NbS) in Johannesburg's Jukskei River catchment, including riparian restoration and urban tree planting. Using the SAVi methodology, the report finds that these interventions are economically viable, with a discounted benefit-to-cost ratio (BCR) of 3.06 and cumulative net benefits of ZAR 152 million from 2025 to 2050. The most significant benefits are avoided health costs from water pollution and avoided infrastructure damage from flooding.

Loja, Ecuador, has transformed its urban landscape through the Sistema Verde Urbano, a network of over 600 hectares of green spaces, river corridors, and parks. Developed in partnership with the German Agency for International Cooperation (GIZ) and the Universidad Técnica Particular de Loja (UTPL), the system integrates water management, pedestrian and cycling mobility, and biodiversity restoration to mitigate flooding and heat while improving resident well-being.