FIGURE 2-1 A schematic model showing the links between climate events and outcomes of national security concern, highlighting the roles of exposure and vulnerability. The shaded area corresponds to the event-exposure-vulnerability model in Intergovernmental Panel on Climate Change (2012). Many of these links involve causation in both directions; however, some of the causal links are much more important than others on time-scales that are important for security analysis.

organize how people and societies interact with those systems to meet their needs. It is important to recognize that some human life-supporting systems, including international disaster assistance, protections against pathogens, and markets for key commodities such as grains and petroleum, are global. This means that climate-related events anywhere that affect these systems have the potential to create disruptions elsewhere on the planet.

People, societies, and their support systems have developed over time in ways that leave them well adapted to a range of variations in physical and biological conditions and events in their environments but vulnerable to harm if events go far enough beyond their usual ranges. Climatic change and climate-related events have the potential to affect each of these

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