The U.S. Department of Defense is expanding its strategic stockpile of cobalt, lithium, and graphite at six government depots, a move confirmed by recent investigative reports and policy briefs that warn the practice could divert crucial supplies from the nation’s rapidly growing clean-energy sector.
The stockpiling program, authorized under decades-old national-defense legislation but now operating at a scale not seen since the Cold War, has ignited a direct clash between security planners and climate advocates. Supporters argue that amassing critical minerals shields weapons manufacturers from volatile foreign markets; critics counter that every ton funneled to missile and aircraft production is unavailable for batteries, buses, and renewable-energy storage systems essential to meeting U.S. climate goals.
A December investigation by Mother Jones found that the Pentagon’s Defense Logistics Agency has been “hoarding critical minerals that could power the clean-energy transition” and doing so at the expense of civilian climate action efforts Mother Jones. A parallel brief by the Climate and Community Project concluded that the Defense Department is expanding its mineral reserves “deemed essential for military industries,” triggering fresh concerns about whether green-tech manufacturers will have adequate access to the same materials Climate and Community Project.
The scope of the stockpile
Internal figures compiled by the Transition Security Project, a Washington-based research group, indicate the current reserve includes roughly 7,500 metric tons of cobalt and 50,000 metric tons of graphite—enough raw material to electrify more than 100,000 transit buses or produce 80.2 gigawatt-hours of battery capacity, double the national installed energy-storage base. Lithium purchases have also accelerated, though DLA officials have not released exact quantities.
Those purchases follow established logic: U.S. law empowers the Pentagon to acquire “strategic and critical materials” to ensure weapons programs can continue unimpeded during wartime or trade disruptions. During the Cold War, Congress regularly funded such reserves to hedge against embargoes. Today, with global commodity markets shaped by geopolitical rivalries, the Pentagon is again leaning on that authority and applying it well beyond rare-earth elements to minerals at the heart of the clean-energy boom.
Who wants what—and why
Senior defense officials insist the expanded stockpile is necessary. China refines an estimated 70 percent of the world’s cobalt and controls a similar share of graphite processing, making the United States “dangerously dependent on potentially adversarial supply chains,” according to position papers circulated by the Heritage Foundation and cited by DLA planners. In their view, diverting a limited slice of global production into government vaults is prudent insurance.
Climate advocates see the calculus differently. “We’re looking at a stark choice between missiles and buses,” said Lorah Steichen of the Transition Security Project. “When the Pentagon buys these minerals, they are removed from circulation. In military systems, they’re often destroyed; in civilian applications, they can be recycled over and over again.” The contrast sharpens with graphite: once packed into a battery, the mineral can be recovered at end-of-life; once used in a rocket nozzle, it is incinerated.
Opaque procurement and accountability gaps
Transparency presents another significant challenge. Julie Klinger, a University of Wisconsin geographer who studies resource security, notes that federal procurement rules do not require the Defense Department to disclose quantities or origins of critical minerals in real time. “There is no mandatory public reporting, which makes it exceedingly hard to track how much is being bought, where it is stored, or how quickly it will be used,” Klinger said. That opacity hinders legislators and the public from weighing national-security benefits against lost opportunities for climate progress.
The International Energy Agency, while not directly commenting on Pentagon policy, has repeatedly emphasized that the same minerals stockpiled for defense are indispensable for manufacturing electric-vehicle batteries, grid-scale storage, wind-turbine magnets, and high-efficiency solar cells. Many of these technologies rely on rapid year-over-year expansions in mineral supply to meet climate-policy timetables. The Defense Department’s activities, critics warn, could create short-term shortages or inflate prices, slowing adoption curves just as the U.S. aims to cut greenhouse-gas emissions in half by 2030.
Environmental footprint of the military
The debate gains urgency from the Pentagon’s own environmental record. As the single largest institutional greenhouse-gas emitter on the planet, responsible for roughly 80 percent of all federal emissions, the U.S. military faces mounting pressure to decarbonize its operations. Yet its appetite for strategic minerals often runs counter to that goal. In addition to stockpiling, the department has invested in mining projects in Alaska, Idaho, and—through joint ventures—Saudi Arabia, further entangling defense spending with extractive industries that can leave significant ecological scars.
Supporters of mineral stockpiling contend that defense and climate priorities are not mutually exclusive. “If the United States loses access to critical minerals in a crisis, weapons production stops and deterrence collapses,” one retired procurement officer said. “That instability would be catastrophic for the global economy and, by extension, for any coherent climate policy.” The officer also argued that military demand represents a fraction of global consumption and therefore does not meaningfully crowd out renewable-energy manufacturers.
Recyclability and single-use dilemmas
Researchers push back by highlighting fundamental differences in how minerals are used. Cobalt, lithium, and graphite embedded in batteries achieve multiple life cycles: after powering electric vehicles, they can be repurposed for stationary storage, then recycled for reuse. Military applications—from armor-piercing projectiles to high-temperature rocket components—tend to obliterate the material. “These resources literally get blown up,” Klinger said. The Pentagon’s mineral strategy is structurally tilted toward single-use destruction, undermining circular-economy principles.
History rhymes, but stakes have changed
The United States last built a comparable mineral cache in the 1950s. The objective was then to out-produce the Soviet Union, not to fight climate change. Today’s stockpile replays the security logic but collides with an energy landscape in which cobalt and lithium determine how fast household appliances go electric and how resilient the grid becomes during heat waves. The dual imperatives—defend the nation and decarbonize it—now compete for the same finite inputs.
Toward a policy reconciliation
Reconciling those imperatives will demand clearer data and open debate. Congress could order real-time reporting on DLA mineral purchases and require cost-benefit analyses that weigh security gains against carbon-reduction delays. The Pentagon could prioritize recyclability in weapons design, reducing net demand. Civilian agencies might broaden strategic stockpiles of their own, ensuring that mass-transit authorities and battery manufacturers receive guaranteed allocations during supply shocks.
More ambitiously, lawmakers could redefine “criticality” to include climate significance, not just battlefield utility. That reframing would sharpen the trade-offs at the heart of the issue and force explicit accounting of whose future is being secured by stockpiling—an army’s or the planet’s. With global demand for cobalt projected to triple by 2030, the window for aligning mineral policy with climate goals is narrow.
What happens next
Defense officials are expected to deliver their next congressionally mandated stockpile report in early 2026. Environmental groups plan to scrutinize the document for purchase volumes, depot locations, and draw-down schedules. Meanwhile, battery manufacturers continue to lobby for tax credits and procurement guarantees that might insulate them from military competition.
Whether the United States ultimately chooses missiles or buses, the decision will shape both the nation’s security posture and its carbon trajectory for decades. For now, the Pentagon’s vaults keep filling, and the minerals that could electrify the future remain locked behind barbed wire and bureaucracy.
Sources
- https://www.motherjones.com/politics/2025/12/the-pentagon-is-hoarding-critical-minerals-that-could-power-the-clean-energy-transition/
- https://climateandcommunity.org/research/mining-for-war/
