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In 2025, the U.S. experienced 23 billion-dollar weather and climate disasters costing $115 billion, ranking it the third-highest year on record. The year was dominated by a record 21 billion-dollar severe storm events and the costliest wildfire in U.S. history, the Los Angeles wildfires. Since 1980, the frequency of such disasters has surged, with the average time between events dropping from 82 days in the 1980s to just 10 days in 2025.

Connecticut is experiencing accelerating climate risks, including more frequent extreme precipitation, rising sea levels, and increasing temperatures. The report details specific historical damages, such as a $300 million storm in August 2024 and $21 million in agricultural losses in July 2023. It projects significant future costs, including $5.3 billion for seawalls by 2040 and a 400% increase in days over 90 in Connecticut by 2050. The document provides comprehensive lists of potential adaptation costs across infrastructure, public health, and individual expenses to mitigate these hazards.

The report analyzes 22 extreme weather events in 2025, noting that despite weak La Nina conditions, global temperatures remained exceptionally high due to human-driven emissions. It emphasizes that warming of approximately 1.3°C has intensified heatwaves, droughts, and floods, with a specific focus on how women and marginalized groups bear a disproportionate burden. The document also identifies a critical gap in climate science, where a lack of observational data in the Global South hinders confident analysis of rainfall events. Finally, it argues that while adaptation is necessary, events like Hurricane Melissa in the Caribbean demonstrate that adaptation has limits and cannot replace the urgent need for rapid emission reductions.

Climate change is driving global wine production to historic lows, with sparkling wine facing specific threats to its quantity and quality. Extreme weather in France, Spain, and Italy has led to reduced yields and price increases for labels like Cava and Prosecco. Higher temperatures are accelerating ripening, which alters the balance of sugar and acid, potentially resulting in higher alcohol levels and less fizzy wines. Projections suggest that if global temperatures rise by 2°C, over half of suitable wine-growing regions could shrink, with up to 90% of traditional areas in southern Europe becoming economically unviable. Adaptation strategies, such as relocating vineyards or using protective technology, are costly and may fail to preserve the unique cultural and flavour characteristics of traditional sparkling wines.

The document reports that 2025 is virtually certain to be among the top five hottest years globally, driven by rising carbon pollution from fossil fuels. In the U.S., record high temperatures significantly outpaced record lows, and the year saw a record-costly start for billion-dollar weather and climate disasters, including the most expensive wildfire event on record in Los Angeles. Globally, carbon pollution intensified Hurricane Melissa, which devastated Jamaica. The report also highlights a trend of 'hydroclimate whiplash' contributing to both the Los Angeles fires and deadly flash floods in Texas, while noting that the U.S. has rolled back key clean energy policies and is set to withdraw from the Paris Agreement by January 2026.

The document outlines the current state of global deforestation, noting that 8.1 million hectares were lost in 2024 and that the world is off track to meet the COP26 goal of halting and reversing deforestation by 2030. It identifies agriculture as the primary driver, accounting for 86% of global deforestation over the last decade, and highlights the critical role of old-growth forests in carbon storage. The guide also notes that climate-driven risks, particularly wildfires, have become leading causes of forest loss, with fire becoming the principal driver of tropical forest loss for the first time in 2024.

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.

Washington State faces escalating risks from drought, wildfires, extreme heat, and coastal flooding, which threaten its economy, ecosystems, and critical US military installations. While federal agencies like NOAA and FEMA provide essential forecasting, funding, and disaster recovery services, the report argues that recent and proposed budget cuts for FY2026—including the termination of key research laboratories and the reduction of grant programs—significantly degrade the state's capacity to prepare for and respond to these hazards.

Hawaiʻi faces significant economic and security risks from sea level rise, wildfires, and drought, which threaten both civilian infrastructure and critical US military hubs like Joint Base Pearl Harbor-Hickam. While federal agencies provide essential monitoring and recovery support, proposed FY 2026 budget cuts would eliminate key programs such as the Hawaiʻi Sea Grant and the Pacific Islands Climate Adaptation Science Center, potentially reducing disaster relief and hindering climate adaptation efforts.

The document introduces attribution science as a method to measure how human-caused climate change affects the likelihood, frequency, and intensity of weather events by comparing current observations with simulated 'counterfactual' worlds. It details Climate Central's specific tools, such as the Climate Shift Index (CSI) for air and sea surface temperatures and the Tropical Cyclone CSI for hurricane wind speeds. The guide distinguishes between different types of attribution—event, trend, source, and impact—and notes that while temperature-related events are highly quantifiable, other severe weather like tornadoes remains an active area of research.

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.

The document outlines how human-caused climate change affects different weather phenomena. It states that extreme heat, marine heat waves, and the intensity of heavy rain and hurricanes are increasing, while extreme cold is becoming less likely. It notes that while climate change increases hot, dry conditions contributing to droughts and wildfires, other factors like land use also play a role. For localized severe storms, the document explains that current climate models cannot yet accurately simulate specific events to make direct attribution statements.

The Canadian Climate Institute proposes six key policy improvements to enhance Canada's climate competitiveness: modernizing industrial carbon pricing, expanding clean electricity grids, finalizing methane regulations for the oil and gas sector, maintaining electric vehicle sales requirements, establishing a national climate investment taxonomy, and deploying the National Adaptation Strategy.

The Canadian Climate Institute proposes six policy priorities for Canada's upcoming climate competitiveness strategy: modernizing industrial carbon pricing, expanding clean electricity grids, finalizing methane emission rules for oil and gas, maintaining the electric vehicle mandate, establishing a national climate investment taxonomy, and implementing the National Adaptation Strategy.

A coalition of health, environmental, and academic organizations is calling on the Canadian government to join the Global Initiative on Information Integrity on Climate Change. The signatories argue that climate disinformation, perpetuated by fossil fuel and digital technology companies, endangers public health and safety, specifically citing how false narratives during summer wildfires hampered emergency responses. They urge Canada to follow the lead of Brazil, the UK, and France in committing to dismantle these information threats.

The report argues that the Amazon forest is a strategic economic asset for Brazil because it regulates the 'flying rivers' that distribute rainfall across the country. Deforestation of approximately 20% of the biome has already led to significant financial losses in the hydroelectric sector and increases vulnerability in agriculture, urban water systems, and logistics. The authors conclude that protecting the forest is a national strategic imperative to ensure economic stability and development.

A national survey conducted by Nanos for the Canadian Association of Physicians for the Environment in October 2025 found that 65.4% of Canadians view climate change as an important priority for the government. The report highlights strong support for methane regulation (64.5%) and a high sense of urgency (75.2%) regarding government action to reduce health risks associated with climate change, such as wildfires and heat waves. These sentiments are significantly more pronounced among 'progressive' voters and those who would consider voting for both the Liberal and NDP parties.

Canada is failing to meet its 2030 climate goals due to rising emissions in the oil and gas sector and the weakening of climate policies by federal and provincial governments. The Canadian Climate Institute emphasizes that climate damages now offset approximately half of the country's expected annual GDP growth. To recover, the document recommends modernizing industrial carbon pricing, implementing clean electricity investment tax credits, finalizing oil and gas methane regulations, and establishing a climate investment taxonomy. It also calls for integrating flood and wildfire resilience criteria into federally funded housing to mitigate future economic losses.

Between June and August 2025, human-induced climate change significantly increased global temperatures, with at least 22% of the global population experiencing temperatures at Climate Shift Index (CSI) level 2 or higher every day. Nearly 955 million people faced 30 or more 'risky heat days' added by climate change, with the highest impact seen in Asia. The report also documents severe climate-driven events, including record rainfall and flooding in China, India, Pakistan, and the U.S., as well as historic wildfires in Europe and Canada.

The Canadian Climate Institute calls for urgent federal action to address climate threats to health, security, and economic competitiveness. The organization proposes six policy priorities: modernizing industrial carbon pricing, enacting the Clean Electricity Investment Tax Credit, maintaining the Electric Vehicle Availability Standard, finalizing oil and gas methane regulations, establishing a climate investment taxonomy, and applying resilience criteria for federally supported housing.