The study meticulously analyzed historical population growth trends and found a decisive shift occurring in the mid-twentieth century. Prior to the 1950s, the human population experienced accelerating growth rates, fueled by technological advances, increased energy availability, and expanding agricultural productivity. This phase reflected a positive feedback loop where rising population density spurred innovation and economic development, which in turn supported larger numbers of people. However, around the early 1960s, this trajectory reversed, marking the onset of a “negative demographic phase.” In this new paradigm, although total population continued to rise, the global rate of growth began to decelerate markedly.

Professor Bradshaw highlights that this negative demographic phase indicates a fundamental biological and ecological constraint: Earth is becoming increasingly unable to sustain continuous human expansion under existing consumption paradigms. According to their projections, global population is expected to peak between 11.7 billion and 12.4 billion by the late 2060s to 2070s, assuming current trends persist. While this projection may appear daunting, it also underscores the finite nature of ecological resources and the critical limits imposed by planetary biocapacity.

The research further clarifies that the upper bound of population growth has only been possible due to an extraordinary reliance on fossil fuels and the consequent depletion of natural resources at rates far exceeding nature’s regenerative capacities. This overshoot phenomenon, the team argues, has masked the severity of ecological strain by artificially boosting food production, energy supply, and industrial output. However, such dependence on non-renewable resources accelerates climate change, biodiversity loss, and environmental degradation, thereby exacerbating systemic vulnerabilities.

Crucially, the authors estimate a sustainable global population to be approximately 2.5 billion people, assuming equitable distribution and adherence to ecological limits while maintaining comfortable living standards. This figure is dramatically lower than today’s population of over 8.3 billion and starkly illuminates the scale of overconsumption and resource mismanagement. The disparity exposes the urgency of addressing both population stabilization and dramatic shifts in consumption behavior to safeguard long-term global resilience.

Another notable contribution of this research is its focus on the intertwined relationship between population size and environmental impact indicators such as climate warming, ecological footprint, and carbon emissions. The analysis revealed that total population size correlates more strongly with rising environmental stresses than per capita consumption alone. This finding suggests that demographic pressures, when combined with consumption patterns, amplify planetary stress multipliers, necessitating integrated approaches that address both aspects simultaneously.

The study’s implications extend beyond environmental projections and encompass socio-economic stability and human wellbeing. The overshoot of Earth’s carrying capacity threatens food and water security, intensifies inequality, and jeopardizes public health, particularly in vulnerable communities. These cascading effects raise fundamental ethical and policy questions about sustainability, resource allocation, and intergenerational equity, demanding urgent multinational cooperation and informed public discourse.

While the researchers caution against predictions of abrupt societal collapse, their assessment paints a realistic portrait of protracted stress on global systems. They argue that the trajectory of continued overshoot is likely to deepen crises rather than resolve them, potentially precipitating increased conflict, displacement, and environmental volatility. Hence, it is imperative that policymakers adopt long-term planning frameworks that explicitly consider planetary boundaries and integrate ecological economics into development strategies.

Professor Bradshaw and his colleagues advocate a paradigm shift that reconsiders humanity’s relationship with the Earth’s natural systems. This includes radical reforms in energy consumption, land use, agricultural practices, and material resource efficiencies. Policies aimed at stabilizing population growth through education, healthcare, and equitable economic opportunities are equally vital. The research underscores that smaller populations combined with lower per capita consumption present the most viable pathway toward sustainable coexistence with the biosphere.

The urgency of the findings is accentuated by the narrowing window for effective action. The authors emphasize that meaningful environmental recovery and resilience are still achievable but require unprecedented global collaboration and commitment. Future sustainability hinges on rebalancing human demands within Earth’s limits and fostering systemic transformations that prioritize ecological health alongside economic development.

This study, supported by the Kids Research Institute Australia and Population Matters, represents a critical contribution to the discourse on planetary sustainability. It serves as a clarion call to scientists, policymakers, and global citizens alike to recognize the entwined challenges of human population dynamics and environmental stewardship, and to act decisively in shaping a viable future for generations to come.

Finally, the comprehensive methodology, involving ecological growth models and expansive historical datasets, grounds the study in robust scientific analysis. By quantifying the mismatch between population size and biocapacity at a planetary scale, the research sets a new benchmark for understanding human impacts and guides evidence-based strategies to mitigate looming crises. The choices made in the coming decades will indelibly influence the trajectory of humanity and the resilience of Earth’s life support systems.

Subject of Research: People

Article Title: Global human population has surpassed Earth’s sustainable carrying capacity

News Publication Date: 27-Mar-2026

Web References:

• Environmental Research Letters DOI
• Professor Corey Bradshaw Flinders University
• Global Ecology Laboratory Flinders University

References:
Bradshaw, C. J. A., Judge, M. A., Blumstein, D. T., Ehrlich, P. R., Dasgupta, A. N., Wackernagel, M., Weeda, L. J. Z., & Le Souëf, P. N. (2026). Global human population has surpassed Earth’s sustainable carrying capacity. Environmental Research Letters. DOI: 10.1088/1748-9326/ae51aa

Image Credits: Flinders University

Keywords: global population growth, sustainable carrying capacity, ecological footprint, climate change, resource consumption, demographic shift, biocapacity, environmental sustainability, population overshoot, fossil fuel dependence, planetary boundaries, global ecology

The genesis of SELINA’s Communities of Practice lies in a comprehensive, nearly two-year-long collaborative journey involving extensive partner engagement. Over 23 months, SELINA partners held more than 19 consortium meetings, coordinating cross-national knowledge exchange and aligning methodologies for ecosystem assessment, accounting, and valuation. This collective effort has culminated in the creation of multiple national and regional CoPs, each serving as a dedicated knowledge hub that contextualizes ecosystem data and services specific to their geographical and socio-economic realities. As a result, a substantial repository of 29 rigorously reviewed factsheets has been published, offering granular insights into biodiversity metrics, ecosystem conditions, the flow of ecosystem services, and their incorporation into economic accounts.

The SELINA CoPs are designed not merely as transient project-based gatherings but as enduring pillars of knowledge exchange and collaboration. In the short term, they function as national platforms facilitating continuous learning and networking among stakeholders during the project’s life span. These forums promote dialogues that demystify ecosystem science, making it accessible for decision-makers and industry leaders who often grapple with translating scientific findings into practical policies and innovations. By fostering shared understanding, they bridge traditional gaps between ecological research and policy implementation, enabling more informed and sustainable choices.

Beyond the immediate project timeframe, the initiative envisions intermediate and long-term objectives that embed resilience into these communities. Intermediate goals focus on institutionalizing CoPs as formal networks capable of sustaining ongoing cooperation beyond initial funding periods. This involves establishing governance structures, fostering trust among participants, and encouraging resource sharing to facilitate knowledge continuity. Ultimately, the aspiration is to cultivate a robust and self-sufficient pan-European network of CoPs, interconnected yet autonomous, continuing to disseminate expertise and best practices well into the future.

A notable feature of the SELINA CoP framework is its emphasis on cross-national collaboration. Recognizing that ecological challenges often transcend borders, the initiative encourages CoPs from different countries to engage in joint dialogues, exchange best practices, and collaboratively tackle shared issues. These interactions, facilitated through SELINA-organized events or self-initiated community activities, enable the pooling of diverse experiences and innovative approaches. This collective intelligence fosters scalable solutions and spurs the harmonization of ecosystem accounting methodologies across Europe, strengthening the foundations for a unified environmental governance landscape.

Underpinning the CoPs is an advanced science-policy interface that integrates cutting-edge research with practical policymaking tools. The factsheets produced by the CoPs synthesize complex datasets on ecosystem condition and services into comprehensible formats, often employing standardized indicators and accounting frameworks aligned with international standards such as the System of Environmental-Economic Accounting (SEEA). These resources assist stakeholders in quantifying ecosystem contributions to economic and social well-being, enabling the incorporation of natural capital considerations into national statistics, corporate reporting, and public policy evaluations.

Moreover, through these CoPs, SELINA is addressing a perennial obstacle in environmental governance: the fragmentation of knowledge domains. Many ecosystem-related decisions have historically suffered from siloed information streams, lacking integration between ecological science, economic valuation, and social dimensions. The CoPs act as integrative platforms where multidisciplinary expertise converges, facilitating holistic analyses of ecosystem functionality, service flows, and their socio-economic impacts. This systemic perspective is crucial for crafting adaptive management strategies that are resilient to environmental changes and socio-economic uncertainties.

Communication and outreach also constitute vital components of the Communities of Practice model. SELINA has developed a dedicated digital hub where CoP activities, updated factsheets, and event information are continuously published. This ensures transparency, promotes wider stakeholder engagement, and maintains the relevance of the platform amidst evolving environmental challenges. By leveraging digital tools alongside traditional meetings, SELINA enhances the accessibility of ecosystem knowledge, thus broadening its impact beyond immediate participants to reach policymakers, researchers, and the public alike.

Importantly, the CoPs provide a valuable testing ground for methodological innovations in ecosystem accounting and valuation. Through iterative learning processes and mutual feedback loops within communities, best practices are refined and adapted to diverse contexts. This empirical approach enhances the robustness of ecosystem service assessments and their policy applicability, providing evidence-based inputs for ecosystem restoration, conservation funding, and sustainable resource management initiatives at multiple governance levels.

The SELINA project’s integration of CoPs exemplifies a forward-looking paradigm in environmental governance — one that prioritizes stakeholder inclusivity, knowledge co-production, and multi-level cooperation. By fostering enduring, dynamic networks that transcend disciplinary and national boundaries, SELINA contributes significantly to the evolving landscape of ecosystem management in Europe. Its emphasis on embedding natural capital considerations systematically into economic and policy frameworks aligns with global sustainability goals and underpins Europe’s commitment to the EU Green Deal and the UN Sustainable Development Goals.

For professionals, policymakers, and researchers intrigued by this novel approach, SELINA’s new Communities of Practice webpage offers a gateway to explore ongoing initiatives, factsheets, and future events. As the CoPs continue to mature and generate tangible outcomes, they represent a compelling model for scaling ecosystem knowledge integration worldwide. Those interested in contributing to or learning from these vibrant communities are encouraged to connect with national contact points or SELINA project leads, fostering a growing network dedicated to ecosystem sustainability.

In summary, the SELINA Communities of Practice initiative is not just a scientific endeavor but a socio-political innovation in environmental stewardship. Its multi-tiered strategy, uniting scientific rigor with stakeholder engagement and practical tools, paves the way for more informed, transparent, and collaborative ecosystem governance models. As challenges associated with biodiversity loss, ecosystem degradation, and climate change intensify, such integrative platforms are indispensable for harnessing collective expertise towards resilient and sustainable futures.

Subject of Research: Integration of ecosystem knowledge into decision-making processes through Communities of Practice in the SELINA project.

Article Title: SELINA’s Communities of Practice: Catalyzing Sustainable Ecosystem Governance Across Europe

Web References:
https://project-selina.eu/communities-of-practice
http://www.project-selina.eu
https://www.linkedin.com/company/project-selina
https://bsky.app/profile/selinaproject.bsky.social
https://www.youtube.com/@SELINA_HorizonEU

Image Credits: Pensoft Publishers

Keywords: Scientific organizations, Scientific publishing, Ecosystem accounting, Natural capital, Sustainability, Environmental governance, Biodiversity integration