Our present ecocrisis drives human insecurity. Single weather events killed hundreds in 2024, even in wealthy countries such as the United States or Spain. And beyond that staggering toll in human lives lurk staggering amounts of money required to repair and rebuild. In the United States alone, inflation-adjusted disaster-attributable costs have reached on average $153 billion each year. These factors and others make global environmental change a severe risk to human security.

The contentious and ambiguous entanglement that military forces have with their natural environment inevitably sparkles public interest and academic research. So how does the existing scholarly work inform our assessment of this convergence?

Climate change’s potential to aggravate insecurity, particularly through violent conflict, has created a fear that is both widespread and justified. Civil and defense ministries around the world now include climate impacts in their strategic planning, and climate security assessments have become a common policy tool.

It is uncomfortably easy to find connections between environmental change and security around the globe. 2023 began with heat records in Europe, a deadly cyclone in New Zealand, and military deployments in response to forest fires ravaging Canada. An untimely early heatwave scorched Spain and endangered its agricultural production. Cyclone Mocha destroyed the livelihoods of thousands in northwestern Myanmar, and Typhoon Mawar caused “significant damage” to a terminal building on Guam’s Andersen Air Force Base.