Climate change is no longer only an environmental or economic problem; it is one of the defining geopolitical concerns of this century. As weather patterns shift, global temperatures climb and sea levels rise, climate-driven phenomena are liable to amplify existing geopolitical tensions and create new security challenges. For defence planners, this implies preparing not just for more frequent humanitarian missions, but for a fundamentally different operating environment where extreme weather, population displacement and stressed infrastructure combine to increase the likelihood and intensity of conflict within societies as well between nations, complicating alliances and requiring de-novo revision of capabilities and doctrines.
LT GEN KAPIL AGGARWAL (R)
FOR NEWS ANALYTICS
a 5 mins read.
The term “risk multiplier” implies that climate change rarely creates new conflicts on its own; rather, it magnifies and accelerates underlying tensions of economic inequality, territorial disputes, resource scarcity, and weak governance. Droughts and heatwaves weaken agricultural production and livelihoods, increasing competition over food and water. Sea-level rise and storm surges threaten coastal cities and military bases, degrading infrastructure and forcing costly relocations. Extreme weather can simultaneously damage energy networks and transport corridors, compounding logistical vulnerability. In fragile states, these stressors can erode governance and provide openings for violent non-state actors. Simultaneity of multiple climate events, such as drought (triggering agricultural decline) followed by mass migration, can intensify geopolitical shocks. In short, climate change has the potential to magnify friction across the spectrum of national security concerns.
Climate change can become particularly consequential for geopolitics in the following scenarios:
• Systemic Simultaneity: Climate shocks can often be large-scale and synchronous—heatwaves across multiple breadbaskets, frequent tropical cyclones in a season, or
widespread glacier melt. When several regions experience such events, the capacity of the international community to respond (humanitarian aid, food supply, disaster relief) is stretched thin, increasing the chance that crises will escalate into political conflict.
• Slow / Sudden Onset: Some effects (sea-level rise, desertification) unfold across decades while others (hurricanes, flash floods) are immediate. Defence planning must accommodate both the gradual reconfiguration of strategic landscapes and rapid humanitarian contingencies.
• Cross-Domain Cascading Effects: Climate impacts in one domain (e.g., agriculture) cascade into others (migration, economies, political stability), producing complex, hard-to-predict outcomes that challenge conventional risk models.
South Asia, the Arctic and the Middle East are emerging as climate-triggered theatres of geopolitical competition.
CLIMATE HOTSPOTS
There are many regions where climate instability can manifest into political and economic vulnerabilities and create conditions for conflict.
• South Asia: With nearly two billion people and dependence on Himalayan glacial melt, water scarcity threatens to aggravate rivalry between India, Pakistan, and Bangladesh. Rapid sea-level rise may trigger large-scale migration from Bangladesh, potentially destabilising the region.
• The Middle East: This highly urbanised region with water scarcity is projected to experience extreme heat events incompatible with outdoor human survival. Competition
over the Tigris–Euphrates and Nile basins could heighten tensions among regional powers.
• The Arctic: Melting ice is opening new sea lanes and exposing untapped resources. As global powers compete for access and influence—particularly Russia, the United States, and China—the Arctic could become a theatre of strategic contestation.
• Sub-Saharan Africa: Fragile states face the dual challenge of desertification and rapid population growth. Climate-linked food insecurity could strengthen extremist groups and ignite resource-based conflicts.
GEOPOLITICAL CONSEQUENCES
Reduced freshwater availability and productive land can intensify competition between states and within borders. Transboundary river basins become potential flashpoints
if upstream water scarcity prompts damming or diversion. Polar regions, particularly the Arctic, are open to navigation and resource exploitation as ice retreats, accelerating
competition among polar and non-polar powers over territorial claims, shipping rights, and mineral resources. Diplomacy must therefore evolve to manage resource sharing and access rights.
Migration and Urban Stress: Large-scale displacement, whether internal or cross-border, creates humanitarian obligations and domestic political pressures. Sudden influxes can exacerbate ethnic tensions, strain public services, and become a catalyst for populist backlash. Robust, humane governance that integrates development and orderly relocation mechanisms can mitigate such destabilising effects.
Security Co-operation and Alliance Dynamics: Climate change creates both incentives and friction for co-operation. Shared risks, such as disaster response in small nation-states, incentivise joint exercises and multilateral agreements. Conversely, competition for diminishing resources can strain alliances. Defence planning must prioritise interoperability with partners and consider climate resilience as a metric for alliance-building.
Rising seas, failing crops and mass displacement will increasingly shape military doctrines more than traditional threats.
CLIMATE STRESS & WARFARE
Force Readiness and Training: Rising temperatures and frequent extreme weather events affect personnel health, equipment performance, and training cycles. Heat stress reduces troop endurance and increases heat-related casualties. Extreme weather can also lead to cancellation or relocation of exercises, compromising readiness. Defence forces will need revised training regimens adapted to climate conditions and upgraded medical capabilities in hotter environments.
Infrastructure and Basing: Many military installations—ports, airfields, fuel depots—were sited in an era that did not account for higher sea levels and extreme climate events.
Bases in low-lying regions face chronic flooding and storm damage. Adapting critical infrastructure requires hardening (flood defences, elevated runways), strategic relocation and investment in modular, rapidly deployable alternatives.
Intelligence Planning: Effective threat assessment requires integrated climate, economic, political and social analytics. Intelligence services must incorporate climate risk indicators such as crop yields, water levels and population movement into early warning models. Planning cycles should include climate scenario wargaming that simulates multi-domain and multi-year disruptions.
Logistics and Supply Chains: Modern militaries depend on long, global supply chains. Climate shocks can disrupt sea lanes, damage transport networks, and affect fuel and spare parts availability. Defence planners must build redundancy, preposition supplies in resilient locations, and strengthen local sourcing during regional climate disasters.
Humanitarian Assistance and Disaster Relief: Climate events may increase military involvement in disaster relief. These missions divert resources from other operations. Defence organisations should develop modular units optimised for such assistance.
INDIA-SPECIFIC CHALLENGES
India confronts acute climate risks across its diverse geography, from Himalayan glaciers to coastal megacities. The Indian Ocean Region (IOR), vital for 95% of India’s trade, warms faster than global averages, driving sea-level rise that threatens ports like Mumbai and Chennai while fuelling cyclones and floods. Droughts in the Indo-Gangetic plains and erratic monsoons disrupt agriculture, sparking internal migrations that strain urban planning. Meanwhile, retreating Himalayan glaciers reduce Brahmaputra flows in Assam and could provoke disputes with Bangladesh over transboundary waters. Mass migrations from climate-hit Bangladesh could swell border pressures, blending humanitarian crises with security dilemmas.
Climate change may also escalate Indo-China rivalries, particularly along the Line of Actual Control (LAC). Glacier melt opens new military routes, enabling faster PLA mobilisation, while water scarcity from shared rivers like the Brahmaputra fuels asymmetric competition. China’s infrastructure push under the Belt and Road Initiative (BRI) in vulnerable IOR states such as Maldives and Sri Lanka creates debt traps that undermine India’s security.
Pakistan emerges as another critical actor in the context of the Indus Water Treaty, which has been held in abeyance. Indus basin droughts, worsened by climate shifts, can provoke cross-border tensions. In the IOR, competition over chokepoints like the Strait of Malacca may intensify, with disrupted shipping lanes amplifying naval tensions. These risks erode India’s strategic autonomy and increase reliance on QUAD partnerships with the US, Japan, and Australia. In the most recent Climate Risk Index (CRI 2025, covering 1995–2024), India is ranked 9th globally for being affected by extreme weather events over the long term. Over the last three decades, India is estimated to have suffered around 80,000 deaths and economic losses of approximately USD 170 billion.
Indian defence must treat climate risk as a core security threat, reforming doctrine, basing, logistics and intelligence to withstand escalating environmental disruptions.
DEFENCE PLANNING
Indian defence must embed climate risk analysis in its planning. As per the Defence Acquisition Procedure 2025, resilient infrastructure has to be prioritised. The measures that need to be adopted could be: xIntegrate Climate into National Security Doctrine: Climate risk should be mainstreamed across defence strategy, threat assessments, and procurement.
• Climate Stress Tests and Scenario Building: Regular multi-year scenarios should simulate combined effects of extreme weather, migration, and economic disruption.
• Invest in Resilient Infrastructure and Flexible Basing: Upgrade critical bases for climate resilience and consider mobile or temporary basing options.
• Force Health Protection and Training: Update medical protocols and training schedules for heat and disease risks.
• Enhance Civil–Military Co-ordination: Build frameworks for rapid humanitarian deployments with interoperable structures.
• Diversify Logistics: Create redundant supply chains and climate-resilient hubs.
• Strengthen Climate Intelligence: Integrate satellite and environmental data into early warning systems; leverage ISA, CDRI, and BIMSTEC for regional co-operation.
• Promote Climate Diplomacy: Use defence channels for confidence-building measures.
• Reduce Carbon Footprint: Shift to green energy and resilient energy systems to reduce fuel vulnerabilities.
Climate change is reshaping the global geopolitical and security landscape faster and more profoundly than predicted. It magnifies historical grievances, disrupts economies,
threatens sovereign territories, and accelerates human displacement. Defence establishments must now confront a strategic environment in which environmental instability shapes conflict patterns and national interests. As climate uncertainties escalate, adapting suitable military doctrines, capabilities, and international security frameworks becomes not only prudent but essential.
(Lt Gen Kapil Aggarwal (R), former Director General EME. He is an alumnus of IIT Kharagpur, having done MTech (Electronics). The views expressed are of the author and do not necessarily reflect the views of The News Analytics Herald.)
