In simple terms
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Weathering the Storm: Why Some Bend and Others Break
Climate change affects everyone, but the impacts are not felt equally. Vulnerability explains why some communities are hit much harder, while resilience is their ability to bounce back and adapt.
Imagine two people caught in a sudden, heavy downpour. One person is wearing a high-tech waterproof jacket and is only a few steps from their warm, dry house. The other is wearing a thin cotton t-shirt and is miles from home with no shelter. The rain (the climate hazard) is the same for both, but their clothing (sensitivity) and access to shelter (adaptive capacity) make their experiences, and the health consequences, vastly different. The first person is resilient; the second is vulnerable.
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First, identify the physical exposure to a climate hazard. This means pinpointing which places are in the 'firing line' of climate change impacts, such as low-lying coastal zones facing sea-level rise or arid regions experiencing more intense droughts.
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Next, assess the sensitivity of the population or system. This involves looking at how dependent a community is on climate-sensitive sectors, like rain-fed agriculture, or the demographic profile, such as a high proportion of elderly residents.
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Then, evaluate the adaptive capacity. This is the ability of a place to cope, and it's determined by factors like wealth (GDP), technology, education, infrastructure, and quality of governance. High adaptive capacity reduces vulnerability.
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Finally, synthesize these elements to determine overall vulnerability. A place with high exposure, high sensitivity, and low adaptive capacity is extremely vulnerable. Conversely, a place with low exposure and high adaptive capacity is highly resilient.
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Key formulas
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Full topic notes
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The Core Concepts: Vulnerability, Resilience, and Exposure
To understand the uneven impacts of climate change, we must first be precise with our terminology. The Intergovernmental Panel on Climate Change (IPCC) provides the standard definitions. Vulnerability is not just about being exposed to a hazard; it's a combination of being exposed, being sensitive to its effects, and lacking the capacity to adapt. Resilience is the flip side of this coin – it is the ability of a system to absorb shocks and reorganise while undergoing change, so as to still retain essentially the same function and structure.
Conceptually, vulnerability can be understood as a function of three key elements: $\text{Vulnerability} = f(\text{Exposure}, \text{Sensitivity}, \frac{1}{\text{Adaptive Capacity}}) $. This is not a mathematical equation but a model to show that vulnerability increases with greater exposure and sensitivity, and decreases with greater adaptive capacity.
Exposure: Being physically located in the path of a potential hazard (e.g., living on a coastline).
Sensitivity: The degree to which a system will be affected by the hazard (e.g., an economy based on agriculture is sensitive to drought).
Adaptive Capacity: The resources available to cope with and adjust to the hazard (e.g., wealth, technology, education).
Factors Influencing Climate Change Vulnerability
A multitude of interconnected factors determine a location's vulnerability. These can be broadly categorised into physical and human (socio-economic) factors. Physical factors include geographical location (e.g., latitude, proximity to the coast), topography (e.g., low-lying land), and the local climate regime. Human factors are often more complex, encompassing economic wealth, technology, social structures, demographics, and governance. For instance, a community with a high dependency ratio (many young and elderly people) is more sensitive than one with a predominantly working-age population. Similarly, gender inequality can increase the vulnerability of women, who may have less access to resources and decision-making power.
Contrasting Case Studies: The Netherlands vs. Kiribati
Nowhere is the contrast in vulnerability and resilience clearer than when comparing a high-income country like the Netherlands with a Small Island Developing State (SIDS) like Kiribati. Both nations face extreme exposure to sea-level rise. However, their ability to respond could not be more different, highlighting the critical role of adaptive capacity.
Worked examples
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Using the example of Bangladesh, explain why a low-income country can be highly vulnerable to climate change. [6 marks]
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Bangladesh exemplifies high vulnerability due to a combination of physical and human factors linked to its low-income status.
Compare the climate change vulnerability of the Netherlands and Kiribati. [6 marks]
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A comparison of the Netherlands and Kiribati reveals that while both have high physical exposure, their overall vulnerability differs dramatically due to vast disparities in adaptive capacity.
How it all connects
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Glossary
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Revision flashcards
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Define climate change vulnerability.
The propensity or predisposition of a system to be adversely affected by climate change. It encompasses sensitivity or susceptibility to harm and a lack of capacity to cope and adapt.
Key takeaways
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Exposure: Being physically located in the path of a potential hazard (e.g., living on a coastline).
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Sensitivity: The degree to which a system will be affected by the hazard (e.g., an economy based on agriculture is sensitive to drought).
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Adaptive Capacity: The resources available to cope with and adjust to the hazard (e.g., wealth, technology, education).
Practice — then mark it
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Test Your Knowledge on Global Climate Vulnerability
Test Your Knowledge on Global Climate Vulnerability
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