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Climate Central's analysis of 239 major U.S. cities from 1970 to 2025 found that 95% of these cities experienced an increase in 'mosquito disease days'—days with temperatures suitable for West Nile virus transmission. On average, these cities saw an increase of 18 days per year. The largest increases occurred in the Southeast, Northeast, and Northwest regions, with San Francisco, CA, seeing the highest increase of 52 days. The report also notes that while West Nile virus is the most common mosquito-borne disease in the U.S., warming is expanding the risk and range of other viruses like dengue and Zika, particularly along the Gulf Coast and into the Ohio Valley and Upper Midwest by 2050.

The briefing examines how global warming, extreme weather, and habitat loss facilitate the spread of the Andes hantavirus by expanding the range of its primary reservoir, the long-tailed mouse. It highlights a current lethal season in Argentina with 101 confirmed cases and 32 deaths, noting that the virus has appeared in regions like Tierra del Fuego where there are no historical records. The text emphasizes that this is a matter of climate justice, as rural communities in Argentina and Chile are disproportionately affected despite contributing least to the climate crisis. It calls for mitigation through the cessation of fossil fuel use and adaptation via improved epidemiological surveillance and medical training in non-endemic areas.

The research finds that investing in climate services for health (CSfH)—such as early warning systems and disease surveillance—yields economic returns between US$3.60 and $68.40 per dollar invested. Despite these high returns and modest funding requirements, such as an estimated $12–$18 million annually for a median-sized developing country, these tools remain underfunded and underused. Currently, only 23 percent of surveyed WMO Member States integrate meteorological data into health surveillance systems to manage risks from diseases like malaria, dengue, and heatstroke.

Analysis of 244 U.S. weather stations shows that 86% of locations have seen an increase in extremely warm winter days since 1970, with the coldest day of the year warming by an average of 7°F across 242 locations.

The report finds that a majority of Americans believe global warming is happening and is primarily human-caused, though many underestimate the level of public concern. While most perceive global warming as affecting U.S. weather and extreme events, few discuss the topic frequently with others.

The Fall 2025 'Climate Change in the American Mind' report finds that 72% of Americans believe global warming is happening, with 58% attributing it primarily to human activities. While 64% of adults express worry about global warming, a significant majority (61%) underestimate the prevalence of this concern among the general public. The report highlights a high level of perceived risk, with majorities believing global warming will harm plant and animal species (69%) and future generations (68%). However, personal and social engagement remains relatively low, as 44% of respondents say they never discuss global warming with family and friends. Consumer activism is present but limited, with 31% of Americans reporting they have rewarded companies taking steps to reduce global warming through their purchases in the past year.

The Fall 2025 report on 'Climate Change in the American Mind' reveals that 72% of Americans believe global warming is happening, with 58% attributing it primarily to human activity. While 64% express worry about global warming, a significant majority (61%) underestimate the prevalence of this concern among their fellow citizens. The report highlights a strong perception that global warming is currently affecting U.S. weather, particularly extreme heat (74%), wildfires (72%), and droughts (72%). Despite these beliefs, frequent discussion of the topic remains low, with 44% of adults stating they never discuss global warming with family and friends. Personal importance of the issue has declined to 59%, the lowest level in 10 years. Consumer activism is present but limited, with 31% rewarding climate-friendly companies and 26% punishing those opposing climate action over the past year.

A coalition of over 50 organizations in Latin America and the Caribbean (LAC) demands urgent, health-centered climate action to protect vulnerable populations. The document highlights that the region faces severe health risks from heatwaves, air pollution, and vector-borne diseases, yet lacks sufficient national health-climate plans and dedicated financing. It calls for the alignment of Nationally Determined Contributions (NDCs) with health goals, a just transition away from fossil fuels, the implementation of the Escazú Agreement, and the inclusion of health indicators in international climate funding.

A May 2025 survey of 1,040 American adults reveals that 69% believe global warming is happening and 60% attribute it to human causes. While 65% of respondents are at least 'somewhat worried' and many perceive risks to their local communities from extreme weather, 65% rarely or never discuss the issue with family and friends. The report also highlights a sense of personal agency, with 60% disagreeing that it is too late to act and 53% disagreeing that technology alone can solve the problem without individual life changes.

The study finds that while Kenya recognizes the link between climate change and public health, the two sectors operate independently in terms of policy formulation, planning, and budgeting. Barriers to integration include a siloed institutional approach, limited funding, and a perception of the health sector as a casualty rather than an adopter of climate policies. To overcome these, the authors suggest launching a Kenya Climate Change and Health Strategy, incorporating health issues into Nationally Determined Contributions (NDCs), and adopting holistic frameworks like the One Health model.

The document examines the limited integration of health and climate policies in Germany, identifying systemic barriers such as financial constraints, federal governance complexities, and a weak science-to-policy interface. It highlights opportunities for synergy within health sector reforms and the untapped potential of climate-health co-benefits. Stakeholders recommend strengthening intersectoral collaboration, implementing binding legislative requirements, and improving the evidence base to achieve socially just and effective climate-health policies.

Climate Central's analysis of 241 U.S. cities shows that 97% experienced an increase in average spring temperatures between 1970 and 2024, with an average rise of 2.4°F. The Southwest saw the most significant warming, and 80% of analyzed locations now experience at least one additional week of warmer-than-normal spring days. These trends are linked to global warming and contribute to increased wildfire risk, prolonged allergy seasons, and stressed water supplies in the western U.S.

The report evaluates the health integration of NDCs from several countries, finding that while many recognize the health benefits of climate mitigation, most lack measurable health targets, dedicated funding for health adaptation, and alignment with 1.5°C pathways. It provides specific analyses for countries including Brazil, the UK, and the UAE, and offers recommendations for 'Healthy NDCs 3.0' that prioritize health as a central pillar of climate action.

A case study in Bharatpur, Nepal, reveals that dengue and skin infections are significantly associated with proximity to garbage disposal sites, with skin infections further linked to reliance on surface water. While nature-based solutions (NBS) like green streets and rainwater harvesting show potential for reducing hazards by managing stormwater and improving hygiene, the report concludes that NBS cannot substitute for essential urban infrastructure such as piped water and municipal solid waste management.

The report details how climate change is increasing the frequency and severity of extreme weather in Oregon, leading to significant economic losses and infrastructure needs. Key risks include intense heatwaves, devastating wildfires, disrupted water supplies for agriculture, and coastal flooding. The document provides specific cost estimates for adaptations, such as school air conditioning and coastal protection, while outlining the broader systemic risks to public health, fisheries, and the state's $5.7 billion agricultural industry.

Climate change in Illinois is manifesting as increased precipitation, rising temperatures, and intensified summer droughts, leading to significant infrastructure damage and public health risks. Since the 20th century, average annual precipitation has risen by 12-15%, while extreme events have increased by 40%, causing frequent flooding and sewage overflows in cities like Chicago. Rising temperatures are most pronounced in winter, with a predicted average increase of up to 9°F by 2100, which threatens agricultural yields—potentially reducing corn yields by 23-34% by mid-century—and necessitates an estimated $6.1 billion for school air conditioning by 2025. Additionally, intensified summer droughts threaten crop yields and river navigation, notably impacting barge transportation on the Mississippi River, while increasing the risk of wildfires and health issues from Canadian wildfire smoke.

Maryland is experiencing accelerating climate risks, including rising sea levels, more frequent extreme precipitation, intensified droughts, and increasing temperature extremes. These changes are causing significant land loss, infrastructure damage, and public health crises, necessitating costly adaptation measures such as seawalls, flood-proofing, and cooling systems.

The report details how climate change is increasing the frequency and severity of extreme weather in Michigan, leading to significant infrastructure damage, public health risks, and economic losses in tourism and agriculture.

The report details how climate change is increasing the frequency and severity of extreme weather in New Hampshire, leading to significant infrastructure damage and economic losses. It highlights a 12% increase in annual precipitation since 1901, a 2°F rise in average annual temperature since 1971, and a 7-inch rise in sea level since 1950. The document outlines necessary adaptation costs across public health, infrastructure, and local planning to mitigate risks to the state's winter recreation industry, coastal properties, and public school systems.

The document explains how climate change—specifically warmer winters, hotter summers, and altered precipitation—is expanding the range and survival of disease-carrying insects like mosquitoes and ticks. It highlights specific threats in the US, such as Eastern Equine Encephalitis in New England and Lyme disease in the Northwest, while noting that over 8 billion people could be at risk of malaria and dengue by the end of the 21st century if emissions continue to rise. The guide advises reporters to examine weather patterns, social determinants of health, and to consult vector biologists.