Published today in Nature Ecology & Evolution, the study projects that if global greenhouse gas emissions continue on their current trajectory, rising temperatures and shifting rainfall patterns could amplify tree pest and disease pressure across more than 80 percent of North American forests by mid-century. The implications stretch far beyond the timber industry: these forests serve as some of the planet’s most important carbon sinks, filter the air billions of people breathe, and anchor entire regional economies. Their transformation, the researchers warn, is not a distant possibility but a process already underway.

“The forests that exist today aren’t going to be ones existing in 2040,” said Dr. Jonathan Davies, professor in the departments of forest and conservation sciences and botany at the University of British Columbia and senior author of the study. “The process is happening already. I think we’ve got to put everything on the table because the status quo is no longer tenable.”

To arrive at these projections, the research team assembled an extraordinarily rich dataset: observations from more than one million individual trees across the United States and parts of Canada, combined with both current and historical climate records. By analyzing where tree damage from insects and pathogens has occurred and how those occurrences correlate with climatic variables, the team built statistical models capable of forecasting where future risks are most likely to emerge under continued warming. The result is a set of continent-scale risk maps that reveal, in unprecedented detail, which forests face the greatest threats and from which agents.

The findings paint a picture that is anything but uniform. Climate change, Dr. Davies explains, is creating a complex mosaic of winners and losers rather than affecting every forest in the same way. Perhaps counterintuitively, the forests most likely to suffer are those that have historically been coolest. As temperatures rise, previously cold-limited insect populations and pathogens are expanding their ranges into ecosystems that never evolved defenses against them. In some historically warmer regions, the effects may be smaller—or even reversed—as conditions become less favorable for certain pests and pathogens already at the thermal limits of their tolerance.

Among the species facing the steepest projected increases in pressure are northern and mountain-dwelling trees: gray willow, Rocky Mountain fir, and—perhaps most iconically—black spruce, the slow-growing conifer that dominates vast stretches of the boreal forest and stores enormous quantities of carbon in its soils. The prospect of losing these trees carries global significance. Boreal forests are among the largest terrestrial carbon reservoirs on Earth, and their degradation would not merely eliminate a carbon sink; it could actively convert these ecosystems into carbon sources, creating a feedback loop that accelerates the very warming driving the problem.

The insects themselves tell a compelling story about what warming makes possible. More than 60 percent of the areas examined are projected to experience 30 percent more insect pressure by mid-century, with insects posing the more immediate threat compared with pathogens. Among the most notorious beneficiaries of a warming climate is the spongy moth, an invasive defoliator already wreaking havoc in Canadian forests, which is projected to expand significantly across eastern North America. Another is the hemlock woolly adelgid, a tiny sap-sucking insect that has already devastated hemlock forests throughout parts of eastern North America, killing mature trees and transforming the composition of entire forest stands. As winters warm, cold snaps that once killed off overwintering pests fail to arrive, and insect generations that once required two years to complete their life cycles now manage it in one, allowing populations to explode.

For Canada specifically, the projections reveal a fascinating east-west divide. In western British Columbia, the models indicate elevated insect pressure but potentially fewer pathogens, while the pattern reverses in parts of eastern British Columbia—a reflection of the profound differences in climate and forest composition between the two regions. Species of particular ecological concern include limber pine and whitebark pine, keystone trees of the province’s mountain ecosystems that may be especially vulnerable to the combined effects of a changing climate and shifting pest pressure. These five-needle pines already face existential threats from white pine blister rust and mountain pine beetle; the addition of climate-driven stress could push them past a threshold from which recovery becomes nearly impossible.

Yet the study’s authors are careful to acknowledge the limits of their models. Because the underlying damage data is drawn primarily from the United States, projections become less certain further north, where forest conditions diverge from those represented in the training data. “With more local forest health monitoring data, it might be possible for future work to refine these projections for B.C. forests,” said Dr. Zihui Wang, a postdoctoral researcher in UBC’s department of botany and lead author of the study. This data gap represents a genuine vulnerability for a country whose forests cover nearly nine million square kilometers—more than a third of its landmass—and whose forest products sector supports hundreds of communities.

Not every forecast is grim. In a twist that underscores the complexity of ecological responses to climate change, some tree species may actually benefit. Tulip trees and American sycamores in the southeastern United States could see reduced pest and disease pressure as warming conditions become less favorable for the agents that currently attack them. These relative “winners” may expand their dominance in forests that are simultaneously losing other species, reshaping the structure and function of eastern woodlands in ways that are difficult to fully anticipate. But even for these apparent beneficiaries, the long-term picture remains uncertain, as ecological communities reorganize under conditions without historical precedent.

What distinguishes this study from previous work on forest pests is its predictive utility. Rather than documenting damage after the fact, the risk maps produced by Wang, Davies, and colleagues give forest managers a genuine window into the future—and, critically, time to act. “Our maps can help forest managers to identify where additional monitoring and prevention efforts should be focussed,” said Dr. Wang. “We can also project which tree species may be particularly vulnerable and which pests and pathogens could pose the biggest threat, giving us a window into the future and hopefully, a headstart on protecting our future forests.”

The practical interventions that follow from such foresight are diverse. Governments and forest managers can prioritize planting hardier tree species in vulnerable regions. They can create physical barriers to pest or pathogen spread by strategically removing specific trees or entire forest sections, disrupting the continuity that allows outbreaks to sweep unimpeded across the landscape. And they can maintain and enhance tree diversity—a form of ecological insurance, since forests composed of many species are far less likely to be completely destroyed by any single pest or pathogen than monoculture stands. Assisted migration, in which foresters deliberately plant species better suited to future conditions, represents a more controversial option that some researchers argue deserves serious consideration.

Underlying all of these strategies, however, is a more fundamental point that Dr. Davies is eager to emphasize: the findings are a reminder that climate change is not merely a story about weather. Its effects cascade through biological systems in ways that reshape entire ecosystems, and pest dynamics are one of the most potent and least visible vectors of that transformation. “Forests are a fundamental part of our lives, but climate change is reshaping these ecosystems,” he said. “This research is another early warning sign of how we’re altering the climate system and the impact it’s going to have.”

The research was partly funded by the Natural Sciences and Engineering Research Council of Canada. As emissions trajectories continue to point toward a warmer world, the study’s message is unambiguous: the forests that define North America’s landscapes, economies, and carbon balance are being rewritten in real time. Whether the continent’s forests of 2050 resemble those of today depends, in large measure, on decisions made in the next few years—about emissions, about monitoring, and about how boldly forest management adapts to a future that is no longer hypothetical.

The article, titled “Climate and society as one: A (de)coupling future for escalating climate challenges,” was led by Professor Ye Chao of Fudan University, with contributions from researchers in several countries, including U.S. National Academy of Sciences member Jessica Fanzo and European Academy of Sciences members Alexander Baklanov and Michael Meadows. The authors argue that economies, institutions, cultures and technologies do not merely respond to environmental change from the outside. They actively produce, amplify and sometimes reduce climate risks through decisions about energy, land, transport, food, finance and infrastructure. At the same time, changing climate conditions reshape those same social systems. This continuous feedback means that climate change is not an external disturbance imposed on society; it is part of a co-evolving climate–social system.

The distinction has important consequences for the way climate policy is designed. Integrated Assessment Models, or IAMs, are widely used to explore relationships among economic growth, energy demand, emissions and temperature change. These models have helped policymakers compare mitigation pathways, estimate carbon budgets and assess the effects of different energy technologies. However, the authors say that many IAMs still represent social norms, political conflict, public risk perception, institutional trust and governance changes as external assumptions rather than as dynamic forces within the model. This can produce technically sophisticated scenarios that underestimate how people and institutions alter the direction of climate outcomes. A policy may appear optimal on paper but fail in practice because it overlooks public resistance, unequal costs, political turnover or the ability of powerful groups to preserve high-carbon systems.

The researchers describe this gap as a form of “governance decoupling.” International climate commitments often do not translate smoothly into national policies, while national targets can remain disconnected from regional implementation and household behavior. Coordination is also weak among sectors that are physically and economically linked. Energy policy affects transport and industry; agriculture influences land use and methane emissions; finance determines which technologies receive investment; and public health shapes how communities experience heat, pollution and disasters. These interactions unfold over decades, yet political systems often operate on election cycles of only a few years. The result is a collective-action trap in which leaders recognize the long-term danger of emissions but face immediate incentives to protect jobs, prices, voters and existing infrastructure.

To make this relationship more visible, the authors revisit the Environmental Kuznets Curve, a well-known concept in environmental economics. The traditional EKC proposes that pollution may initially increase as economies grow, reach a peak at a particular income level and then decline as wealthier societies adopt cleaner technologies, stronger regulations and less carbon-intensive forms of production. The new Perspective reinterprets this curve not as an inevitable route that every country will follow, but as a map of changing coupling states between economic development and emissions. In this framework, the trajectory of a country depends on institutions, policy choices, technological systems, global trade and historical conditions—not income alone.

The first state, described as “weak coupling,” applies to economies where economic expansion remains closely tied to rising carbon dioxide emissions. Growth in these countries can generate employment and reduce poverty, but it may also increase demand for coal, oil, gas, cement, steel, electricity, private vehicles and carbon-intensive construction. China and India today are presented as examples of this developmental phase, although their trajectories are not identical. The authors compare them with the earlier industrial histories of today’s developed economies, which also experienced periods when rising production and higher living standards were powered by rapidly increasing fossil-fuel use. Weak coupling is therefore not a moral label or a permanent condition; it describes a structural relationship that can change as energy systems and governance evolve.

The second state, “strong coupling,” has a deliberately different meaning from the usual interpretation of decoupling in climate discussions. It refers to economies that continue to grow while their emissions decline, indicating that prosperity and climate action are advancing together rather than moving in opposition. The United States and Germany are cited as examples of economies that passed their emissions peaks decades ago and have since reduced territorial emissions while maintaining high levels of economic activity. Such progress can result from efficiency improvements, renewable energy, fuel switching, industrial restructuring, regulation and changes in consumption. However, the authors caution that falling domestic emissions do not automatically mean that a country has eliminated its climate impact. Imported goods, international aviation, outsourced manufacturing and financial investments can shift emissions beyond national borders, making trade and telecoupling essential parts of the analysis.

The third state, called “de-coupling,” carries a deliberately negative meaning in the proposed framework. It describes an “anti-EKC” condition in which fossil-fuel dependence, institutional weakness or structural poverty prevents economic development from aligning with climate resilience. In such settings, low emissions may not reflect clean prosperity; they may instead reflect limited industrial capacity, energy poverty or a lack of access to modern infrastructure. Conversely, fossil-rich economies can generate substantial revenues while remaining vulnerable to volatile markets, extreme weather and delayed diversification. This distinction is crucial because a simple emissions-versus-income graph can make very different social realities look similar. The authors emphasize that the three states are neither fixed nor necessarily sequential. Governance can move a country toward stronger coupling, stall its progress or reverse earlier gains.

Policy, in this view, is not merely a tool for correcting market failures after emissions have occurred. It is the steering mechanism that reshapes the entire climate–social system. Abrupt reversals of international commitments can weaken confidence, slow investment and push a country away from strong coupling, while coordinated long-term policies can accelerate technological and institutional change. China’s rapid expansion of new-energy vehicles is presented as an example of deliberate intervention bending an emissions trajectory. By 2024, the country had approximately 31.4 million new-energy vehicles on its roads, and such vehicles accounted for 41.83 percent of new registrations. The figure illustrates how industrial policy, infrastructure investment, consumer incentives, manufacturing scale and regulatory standards can interact to transform a major source of emissions.

The authors argue that making this framework operational will require more than attaching social variables to existing climate models. They call for “team science” and knowledge co-production involving geographers, climate scientists, economists, sociologists, political scientists, public-administration experts and communities affected by climate policies. One possible direction is to combine IAMs with agent-based models, which simulate how households, firms, governments and other actors make decisions under changing information, incentives and constraints. Such integrated approaches could represent feedbacks that conventional models often simplify, including public trust, social inequality, political polarization, institutional learning and behavioral change. Emerging initiatives—including the Earth Commission’s Safe and Just Earth System Boundaries, citizens’ climate assemblies, Just Transition funds and open-data platforms such as OS-Climate—illustrate how science, governance and public participation might be brought into closer alignment. In a world shaped simultaneously by geopolitical instability, trade tensions, artificial intelligence and accelerating environmental change, the researchers say that strengthening the coupling between climate and society may be the most important step toward making climate solutions not only technically possible, but socially durable.

Subject of Research: Climate–society systems, climate governance, economic development and carbon-emissions trajectories

Article Title: Climate and society as one: A (de)coupling future for escalating climate challenges

Web References: https://doi.org/10.1016/j.scib.2026.03.026

References: Science Bulletin, DOI: 10.1016/j.scib.2026.03.026

Image Credits: © Science Bulletin

Keywords: climate change, carbon dioxide emissions, climate governance, Environmental Kuznets Curve, economic development, strong coupling, weak coupling, de-coupling, integrated assessment models, social–ecological systems, just transition, new-energy vehicles

The study presents an in-depth analysis of the perceptions of various stakeholders, illustrating a troubling gap in understanding the intersection of climate science and public policy. By critically evaluating the viewpoints of parliamentarians and the general populace, the research underscores a misalignment between scientific recommendations and societal actions. With the world facing a climate crisis that demands swift and comprehensive measures, this research serves as a wake-up call for policymakers and climate communicators alike.

At the heart of the study are significant findings that indicate a lack of urgency in addressing greenhouse gas emissions. The research team utilized various methodologies, including surveys and interviews, to gauge the understanding and attitudes of both parliamentarians and the public regarding climate change timelines. Surprisingly, many respondents expressed a belief that we have ample time to reverse trends in greenhouse gas emissions, a notion that contradicts established scientific timelines suggesting we must peak emissions imminently to avert catastrophic climate outcomes.

The implications of this misjudgment cannot be overstated. As the planet continues to experience unprecedented changes due to climate change—ranging from record-breaking heatwaves to devastating floods—the urgency for immediate action becomes more apparent. The findings of this study emphasize that if key decision-makers and the public do not grasp the severity of the situation, there is a risk that policies aimed at mitigating climate change will be delayed or insufficiently robust. This disconnect could have profound consequences for global efforts to achieve climate stabilization goals.

Furthermore, the research highlights the role of misinformation and public discourse in shaping perceptions about climate change. In a media-driven society, the narratives that dominate public conversation can heavily influence how individuals and leaders understand and prioritize climate issues. As such, the study points to the necessity of clearer, more accurate communication surrounding climate science. It advocates for a targeted approach that seeks to inform the public and parliamentarians about the dire realities of climate change, thereby fostering a culture of urgency and proactive engagement.

In analyzing the responses from parliamentarians, the study found that many were influenced by constituents’ beliefs and attitudes towards climate action. This suggests that lawmakers often mirror public sentiment, which can lead to significant delays in implementing vital environmental policies. Thus, a more informed public is not just a goal but a necessity for effective legislative action. This finding reflects an opportunity for climate advocates to engage with communities, enhancing awareness and promoting a greater understanding of the scientific consensus on climate urgency.

Moreover, the study probes into the psychological aspects of climate change perception, revealing that the daunting nature of climate science often leads to avoidance and apathy among the public. Individuals can feel overwhelmed by the vastness of the problem, leading to a sense of helplessness. Therefore, it is imperative to empower communities with both knowledge and tools for action. The research proposes that public engagement should include not only awareness campaigns but also discussions that foster a sense of agency in tackling climate change collectively.

The findings point to the critical need for climate education at all levels of society, particularly in schools and community organizations. By instilling a sense of environmental responsibility and urgency in younger generations, there exists a potential to shift the narrative around climate action in the long term. This intergenerational approach to climate education can help bridge the gap between current perceptions and the necessary conditions for effective climate action.

As the study wraps up its analysis, it calls for a paradigm shift not only in how climate information is communicated but also in how societal values surrounding climate change are cultivated. It urges both communication scientists and climate advocates to develop innovative strategies that can break through entrenched misconceptions and foster a more realistic understanding of the climate crisis. Central to this shift is the idea that urgency and immediacy in addressing climate change should not be a point of debate but rather a foundational principle guiding public dialogue and policymaking.

In conclusion, the research conducted by Kenny and Geese represents a critical intersection of science and society, probing the perceptions that hinder effective climate action. The underestimation of the urgency surrounding peak global greenhouse gas emissions must be met with dedicated efforts in education, policy adaptation, and public engagement. The dire reality of climate change is becoming increasingly evident, and the time for immediate action is now. If we hope to steer the planet towards a sustainable future, we must first address the misconceptions that cloud our judgment and diminish our collective resolve.

To realize a world where climate action is prioritized, communication must evolve to reframe the conversation. The study serves as a reminder that knowledge is power, and when combined with an understanding of the urgent need for change, it has the potential to mobilize action at unprecedented levels. Social change often begins with awareness, and in the face of one of humanity’s greatest challenges, it is essential that all levels of society recognize the immediate need to peak global greenhouse gas emissions.

This research is a clarion call to action; it emphasizes the responsibility of all societal segments—individuals, government officials, and community leaders—to work collaboratively towards a common goal. Knowledge must be harnessed to inspire enthusiasm around climate solutions so the public can rally behind initiatives that promote sustainability and resilience against the backdrop of climate change. With concerted effort and renewed urgency, collective global action can be galvanized to not only peak greenhouse gas emissions but to lay the foundation for a more sustainable and equitable future.

Subject of Research: Public and parliamentary perceptions of climate urgency regarding greenhouse gas emissions.

Article Title: Publics and UK parliamentarians underestimate the urgency of peaking global greenhouse gas emissions.

Article References: Kenny, J., Geese, L. Publics and UK parliamentarians underestimate the urgency of peaking global greenhouse gas emissions. Commun Earth Environ 6, 747 (2025). https://doi.org/10.1038/s43247-025-02655-w

Image Credits: AI Generated

DOI: 10.1038/s43247-025-02655-w

Keywords: Climate change, greenhouse gas emissions, public perception, urgency, communication strategies.