More than a dozen military leaders say the impacts of climate change threaten military readiness and response and will increase instability and conflict around the globe.
Their assessments are included in a recent report, National Security and the Accelerating Risks of Climate Change , by the CNA Corporation’s Military Advisory Board. The report’s authors – including 16 retired generals and admirals from the Army, Navy, Air Force, and Marine Corps – conclude that climate change impacts will act as threat multipliers and catalysts. Projected warming, changes in precipitation , sea level rise, and extreme weather  events will pose risks to security within the U.S. and abroad.
At home, some of the threats are here and now. Many of the nation’s military installations are in coastal areas vulnerable to rising sea levels and storm surges. For example, the low-lying Hampton Roads area of Virginia is home to 29 military facilities. Sea level in the area is projected to rise 1.5 feet over the next 20-50 years and as much as 7.5 feet by the end of the century. One advisory board member, Brig. Gen. Gerald Galloway, stressed that “unless these threats are identified and addressed, they have the potential to disrupt day-to-day military operations, limit our ability to use our training areas and ranges, and put our installations at risk in the face of extreme weather events.”
Figure 1: Sea level rise projections for the Hampton Roads region, which is home to 29 different military facilities. Source: CNA, 2014
The CNA report also identifies the Arctic region as an area of concern for national security. As the loss of Arctic ice potentially opens new shipping routes and provides access to fisheries and energy resources, government agencies will need to update navigation charts and increase communications capabilities and disaster response preparation. In a 2012 report, C2ES also outlined how the Arctic is a bellwether  for how climate change may reshape geopolitics as countries vie for access to territory and resources.
The Defense Department has also voiced concerns about how climate change impacts could affect its missions around the globe. The Pentagon’s 2014 Quadrennial Defense Review  states that the impacts of climate change “...will aggravate stressors abroad such as poverty, environmental degradation, political instability, and social tensions—conditions that can enable terrorist activity and other forms of violence.”
Figure 2: As Artic summer sea ice diminishes, the region offers a newly accessible abundance of resources. Source: CNA, 2014
Drought  and flooding have already contributed to conflicts in Africa, Asia and the Middle East. These types of extreme weather events have been tied to food shortages, desertification, population displacement, and mass migration, posing increasing security challenges. The Years of Living Dangerously , a documentary series airing through June 9 on Showtime, explored how years of drought may have played a role in destabilizing Syria.
To prepare for the potential national security risks associated with climate change, the CNA report recommends that the Defense Department:
The report should be a clarion call for the government, businesses, and individuals to step up their efforts to prepare for the impacts of climate change. Government can leverage relationships around the globe to better protect vulnerable populations where instability may grow. Government agencies can improve their coordination on assessing and managing climate risks. Businesses can contribute to the protection of infrastructure on which they rely. And individuals can work within their communities and workplaces to better prepare for climate impacts that may come our way.