The Vanishing Glaciers of Peru’s Central Cordillera

Aerial view of retreating glaciers in Peru's Central Cordillera, highlighting the dramatic landscape changes.

Alonso Arias, Nicolás Núñez, Pedro Rau, Patrick Venail; Development of a spatial projection map of glacial retreat based on vulnerability maps in the Central Cordillera, Peru. Journal of Water and Climate Change 2024; jwc2024151. doi: https://doi.org/10.2166/wcc.2024.151

A Stark Warning of Climate Change’s Impact

In the heart of Peru, the Central Cordillera‘s glaciers are rapidly retreating, presenting an alarming forecast of what lies ahead if global warming continues unchecked. A recent study conducted by Alonso Arias and colleagues from the Centro de Investigación y Tecnología del Agua at Universidad de Ingeniería y Tecnología, Lima, provides a startling projection: a potential loss of 84–98% of these glaciers by the 2050s. This significant research highlights not only the critical vulnerabilities of Peru’s glacial landscapes but also underscores the broader implications for water resources and Andean communities dependent on these ice reserves.

The Study’s Approach

The research team utilized a sophisticated combination of remote sensing data and spatial analysis tools to map and project the retreat of glaciers from 1990 to 2021, extending these projections to 2055. By employing the frequency index and Shannon entropy index model, the study efficiently pinpoints areas most susceptible to rapid glacial retreat. This method allows for a nuanced understanding of how various factors like surface temperature, elevation, and precipitation interact to accelerate glacier melt. The authors of the study are optimistic that this innovative methodology will encourage similar research on other tropical glaciers in the region, enhancing our understanding and response to glacial retreat in comparable environments.

Implications for Water Resources

The implications of this study are profound. Glaciers in the Central Cordillera are a critical source of fresh water for the surrounding regions, supporting agriculture, hydroelectric power production, and daily water use. As these ice masses dwindle, the potential for water scarcity grows, posing a severe risk to food security and local economies. The study’s projections serve as a crucial tool for regional planners and policymakers, who must prepare for the future by adapting water management practices and developing new strategies to mitigate these impacts.

Human Impact and the Need for Action

The results of this study are crucial for policymakers and planners, as they provide a clear visualization of the areas at greatest risk and the potential timeline for change. These maps and data are essential for developing strategies to manage water resources and adapt to changing hydrological conditions that will impact agriculture, hydroelectric power production, and water supply for millions.

For communities in the Andes, the retreat of glaciers isn’t a distant, abstract problem; it’s a current crisis that threatens their way of life. This direct human connection makes the study particularly effective in communicating the urgency of the climate crisis.

Summing Up

The rapid retreat of Peru’s Central Cordillera glaciers is a microcosm of the global environmental challenges posed by climate change. The research by Alonso Arias and his team is more than a scientific study; it is a stark warning and a guide to potential solutions. By understanding the specific factors contributing to glacial retreat and visualizing their impacts through precise mapping, we can better prepare for and respond to the environmental changes that are reshaping our planet.

As readers and global citizens, we are called upon to support sustainable practices, advocate for responsible environmental policies, and educate ourselves and others about the impacts of climate change. The time for action is now—every effort counts in our collective quest to preserve our world for future generations.


Source: Alonso Arias, Nicolás Núñez, Pedro Rau, Patrick Venail; Development of a spatial projection map of glacial retreat based on vulnerability maps in the Central Cordillera, Peru. Journal of Water and Climate Change 2024; jwc2024151. doi: https://doi.org/10.2166/wcc.2024.151

Ocean in Peril: Understanding the Escalating Threat of Marine Heatwaves and Acidification



Ocean sea life and coral reef. Credit: Francesco Ungaro, Unsplash.


As the planet grapples with climate change, our oceans are experiencing unprecedented shifts. Recent research by Joel Wong, Matthias Münnich, and Nicolas Gruber, Column‐Compound Extremes in the Global Ocean published in the Journal of Oceanic Studies into the increasing frequency, intensity, and spatial extent of compound marine extremes—particularly marine heatwaves combined with ocean acidification—highlights a looming crisis for global marine ecosystems. The study, conducted over nearly six decades, offers important insights into these phenomena and underscores the urgent need for global environmental strategies.

The Escalating Intensity of Marine Extremes

The study analyzes data from 1961 to 2020, revealing a concerning trend in the behavior of oceanic compound extremes, referred to as Column-Compound Extreme Events (CCX). These events, characterized by simultaneous occurrences of extreme heat and acidity, have become more intense and longer-lasting over the years. Such changes are primarily driven by global warming and increased carbon dioxide emissions, which not only warm but also acidify ocean waters at alarming rates.

Impact on Marine Life

The effects of these compound extremes are profound. Marine ecosystems, particularly coral reefs, kelp forests, and the myriad species dependent on them, face severe threats from prolonged exposure to extreme conditions. The study estimates that the habitable space within the water column has potentially reduced by up to 75%, a stark indication of the dire conditions many marine organisms now endure. This habitat compression threatens biodiversity, disrupts fishing industries, and jeopardizes the livelihoods of communities dependent on these ecosystems.

Geographic and Vertical Spread

The research identifies that these extremes are not uniformly distributed. Tropical and high latitude regions, known for their rich biodiversity, are the most affected. The impacts extend beyond the surface, complicating the survival conditions for species that cannot migrate to more hospitable waters.

Role of Climate Phenomena

El Niño and other climate phenomena play a significant role in modulating these compound events. The study highlights specific patterns and regional variations in CCX occurrences, linking them to broader climatic shifts that influence ocean currents and temperature distribution.

Need for Advanced Modeling Techniques

A key contribution of this research is the development of advanced models that enhance our understanding of CCX characteristics and drivers. These models are crucial for predicting future changes and implementing effective conservation strategies. They also serve as a vital tool for policymakers and environmental planners as they prepare to mitigate the effects of these changes.

Summing Up

The findings from the study serve as a clarion call for immediate action. Protecting our oceans from compound extremes requires global cooperation and innovative solutions aimed at reducing greenhouse gas emissions and enhancing marine conservation efforts. This research provides a foundation for understanding the scale of the problem and outlines the critical areas for needed interventions.

The preservation of marine biodiversity and the sustainability of our global ocean ecosystems depend on our ability to respond effectively to the challenges posed by climate change. Through informed policy-making and collaborative international efforts, there is hope for mitigating the impact of these profound marine disturbances.


Source: Wong, J., Münnich, M., & Gruber, N. (2024). Column‐Compound Extremes in the Global Ocean. Journal of Oceanic Studies, 5(3). https://doi.org/10.1029/2023AV001059.

The Pivotal Role of Indigenous Peoples and Local Communities in Biodiversity Conservation



A social outcomes ladder of 6 types of roles of Indigenous Peoples and local communities in conservation governance, based on synthesis of 648 empirical studies.


As global biodiversity continues to face threats from various fronts, the role of Indigenous peoples (IPs) and local communities (LCs) has never been more crucial. A recent study published in One Earth underscores the need for an equitable governance approach that recognizes and empowers these groups, offering sustainable and effective solutions to conservation challenges. Let’s look at transformative roles that IPs and LCs can play in biodiversity conservation, in alignment with the Global Biodiversity Framework targets.

Understanding the Global Biodiversity Framework

The Global Biodiversity Framework, established during the Kunming-Montreal conference, sets ambitious targets to safeguard the planet’s biological resources. A key target within this framework is the conservation of 30% of land and sea areas by 2030 through equitably governed systems. This goal emphasizes the importance of recognizing diverse values, ensuring rights to ancestral territories, upholding cultural practices, and involving all relevant actors in decision-making processes to achieve effective conservation outcomes.

Empirical Evidence and Ecological Outcomes

A comprehensive review of 648 empirical studies reveals that conservation initiatives where IPs and LCs have equal partnership or primary control lead to more positive ecological outcomes. This evidence strongly supports a governance model that respects and integrates the knowledge systems and customary practices of IPs and LCs, enhancing biodiversity conservation’s effectiveness and sustainability.

The Changing Paradigm of Conservation Governance

Traditional conservation methods often overlooked the intrinsic value and knowledge of IPs and LCs, limiting their roles to mere participants. However, a shift towards equitable governance is gaining momentum, where these communities are not only participants but leaders with significant control and recognition of their traditional values and institutions. This approach is proving essential for the ecological success of conservation efforts.

Roles of IPs and LCs in Governance

The typology of roles that IPs and LCs can assume in conservation governance ranges from excluded to autonomous.

The typology structure includes six distinct roles that reflect varying levels of participation, influence, and control:

  1. Excluded: IPs and LCs have no participation or benefits.

  2. Consultees: Minimal influence despite receiving some information or benefits.

  3. Stakeholders: Some ability to influence decisions but limited control.

  4. Partners: Equal partners or co-managers, sharing power in conservation efforts.

  5. Primary Control: Primary authority with respected leadership and rights, though not fully autonomous.

  6. Autonomous: Full autonomy with their knowledge and institutions fully recognized.

Each role on this spectrum provides insights into how different levels of involvement and control impact conservation outcomes. The findings advocate for policies that elevate IPs and LCs from mere stakeholders to leaders, recognizing their capability to manage and conserve natural resources effectively.

Overview of Intervention Types in Conservation Initiatives

Theories about involvement in conservation management suggest that decision-making is a complex process that includes many participants from different levels, all with their own interests and levels of power. The types of interventions identified in the reviewed cases include:

  • Protected and Conserved Areas (67.9%): Most common, focusing on designated areas for biodiversity preservation.

  • Livelihood Projects or Tourism Ventures (56.9%): Projects supporting sustainable livelihoods or integrating conservation with tourism.

  • Species Protection or Sustainable Use Regulations (53.9%): Efforts focused on specific species protection or sustainable resource use.

  • Local or Indigenous Stewardship (36.7%): Direct management or major influence by IPs and LCs in conservation efforts.

  • Ecosystem Restoration (15.7%): Initiatives aimed at restoring ecosystems to their natural states.

  • Incentives, Compensation, Revenue Sharing, or Market Instruments (13.6%): Economic tools to promote conservation.

  • Education and Capacity Building (10.6%): Focus on educating IPs and LCs and building their capacity for conservation.

This complexity means we need to carefully analyze how much influence different participants have at various stages of the conservation efforts. Instead of using simple measures like how often IPs and LCs attend meetings or their personal views on conservation, we should look more deeply at how meaningful their participation is and how the conservation processes are governed. This detailed examination will help us better understand the true role of IPs and LCs in making conservation decisions.

Statistical Analysis and Policy Implications

Statistical analyses corroborate that higher degrees of control and participation by IPs and LCs correlate with favorable ecological and social outcomes. These outcomes not only emphasize the need for a policy shift towards more inclusive governance but also highlight the importance of IPs and LCs in achieving the targets set by the Global Biodiversity Framework. The study suggests that empowering IPs and LCs is not just beneficial but necessary for the long-term success of global biodiversity conservation.

Summing Up

The pivotal role of IPs and LCs in biodiversity conservation is clear. By transitioning to governance models that provide full recognition and control to these communities, conservation efforts can be significantly more effective and equitable. It’s time for conservation policies and practices to reflect this reality, ensuring that IPs and LCs are at the forefront of the decision-making processes, thus safeguarding biodiversity for future generations.


Source: Dawson, N. M., Coolsaet, B., Bhardwaj, A., Booker, F., Brown, D., Lliso, B., Loos, J., Martin, A., Oliva, M., Pascual, U., Sherpa, P., & Worsdell, T. (2024). Is it just conservation? A typology of Indigenous peoples’ and local communities’ roles in conserving biodiversity. One Earth.