Learning Outcomes

By the end of this lesson, learners should be able to:

• Explain the difference between climate hazards and climate risks.
• Describe how exposure and vulnerability influence climate risk.
• Differentiate between chronic and acute physical climate risks.
• Assess the impacts of physical climate risks on infrastructure, business operations, and supply chains.
• Understand why organizations need to integrate climate risk into enterprise risk management.

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Introduction

Climate change is one of the most significant challenges facing organizations, governments, investors, and communities worldwide. Rising global temperatures have increased the frequency and intensity of extreme weather events while also causing gradual environmental changes that affect ecosystems, economies, and societies. These changes create uncertainties that can disrupt business activities, damage physical assets, increase operational costs, and threaten long-term sustainability.

Organizations can no longer view climate change solely as an environmental issue. It is increasingly recognized as a strategic business risk capable of affecting profitability, competitiveness, investment decisions, and organizational resilience. Businesses that understand climate risks are better positioned to protect their assets, adapt to changing conditions, and capitalize on emerging opportunities.

Understanding climate risk begins with distinguishing between climate hazards and climate risks. While hazards describe the physical events caused by climate change, risk reflects the likelihood that these hazards will cause harm after considering how exposed and vulnerable people, infrastructure, and systems are. This lesson introduces these fundamental concepts before exploring the different categories of physical climate risks and their implications for organizations.

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1. Climate Hazards vs. Climate Risks

Although the terms climate hazard and climate risk are often used interchangeably, they have different meanings.

A climate hazard refers to a physical event or long-term climate trend that has the potential to cause damage. Hazards originate from natural processes that are intensified by climate change. Examples include floods, hurricanes, droughts, heatwaves, sea-level rise, and wildfires.

A climate risk, on the other hand, is the possibility that a climate hazard will negatively affect people, businesses, infrastructure, ecosystems, or economies. Risk depends not only on the hazard itself but also on the extent to which assets are exposed and how vulnerable they are to damage.

For example, a severe storm occurring in an uninhabited area may produce little or no economic loss. However, the same storm striking a densely populated coastal city could destroy homes, disrupt transportation, interrupt businesses, and result in billions of dollars in damages. The hazard is identical, but the level of risk differs because of varying exposure and vulnerability.

Climate risk is therefore commonly understood as the interaction of three components:

These three components combine to determine the overall level of climate risk.

A useful way to understand the relationship is:

Climate Risk = Climate Hazard × Exposure × Vulnerability

Reducing any one of these elements can significantly lower overall risk. Organizations may not be able to prevent hazards such as storms or rising temperatures, but they can reduce exposure by relocating assets or reduce vulnerability by strengthening infrastructure and improving preparedness.

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2. Understanding Exposure and Vulnerability

Exposure refers to the presence of people, assets, infrastructure, supply chains, or economic activities in locations where climate hazards may occur.

For example, an airport built along a coastline is exposed to storm surges and sea-level rise. Similarly, agricultural farms located in drought-prone regions have greater exposure to prolonged water shortages.

However, exposure alone does not determine the level of damage. The degree of vulnerability is equally important.

Vulnerability describes how sensitive an organization or community is to climate hazards and how capable it is of responding and recovering after an event. Vulnerability is influenced by several factors including infrastructure quality, emergency preparedness, financial resources, technology, governance, and adaptive capacity.

For instance, two companies may operate in the same flood-prone area. One has elevated facilities, flood barriers, emergency response plans, and insurance coverage, while the other lacks these protective measures. Although both are equally exposed, the second company is considerably more vulnerable and therefore faces greater climate risk.

Organizations can reduce vulnerability through investments in resilient infrastructure, improved planning, employee training, diversified suppliers, insurance, and climate adaptation strategies.

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3. Physical Climate Risks

Physical climate risks arise directly from the physical impacts of climate change. These risks affect buildings, equipment, employees, natural resources, transportation systems, agricultural production, and entire economies.

Physical risks are generally divided into chronic risks and acute risks, each requiring different management strategies.

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Chronic Physical Risks

Chronic physical risks develop gradually over long periods as climate patterns change. Although their effects may appear slow, they can fundamentally alter business environments and economic conditions.

Examples include:

• Rising average temperatures
• Sea-level rise
• Changing rainfall patterns
• Water scarcity
• Desertification
• Ocean acidification
• Long-term ecosystem degradation

Because chronic risks evolve over many years, organizations often underestimate their significance. However, their cumulative impacts can be substantial.

Sea-Level Rise

Sea-level rise results primarily from the melting of glaciers and polar ice sheets, together with the thermal expansion of seawater as global temperatures increase.

For coastal communities and businesses, rising sea levels increase the likelihood of flooding, shoreline erosion, saltwater intrusion into freshwater supplies, and permanent land loss. Ports, airports, tourism facilities, manufacturing plants, and residential developments located near coastlines face increasing operational challenges and higher adaptation costs.

Organizations operating in coastal regions may need to invest in flood defenses, relocate facilities, redesign infrastructure, or modify insurance arrangements to remain resilient.

Heatwaves

Heatwaves are prolonged periods of unusually high temperatures that can significantly affect human health and economic productivity.

Extreme heat increases energy demand as businesses rely more heavily on cooling systems. It can reduce employee productivity, particularly for outdoor workers, increase health-related absenteeism, damage transportation infrastructure such as roads and railways, and disrupt agricultural production.

Industries including construction, mining, manufacturing, logistics, and agriculture are particularly vulnerable to prolonged heat exposure.

Water Scarcity

Many regions are experiencing declining freshwater availability due to changing rainfall patterns and prolonged droughts.

Businesses that depend heavily on water—such as food processing, beverage manufacturing, mining, and agriculture—may experience production constraints, increased operational costs, and competition for limited water resources.

Water scarcity may also generate conflicts between industrial users, communities, and governments regarding resource allocation.

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Acute Physical Risks

Unlike chronic risks, acute physical risks arise from sudden and extreme weather events.

These events typically occur with little warning and often cause immediate destruction.

Examples include:

• Floods
• Hurricanes
• Cyclones
• Storm surges
• Tornadoes
• Wildfires
• Extreme rainfall
• Severe storms

Acute risks frequently result in property damage, infrastructure failure, production interruptions, injuries, and significant financial losses.

Floods

Flooding remains one of the most common and costly climate-related disasters worldwide.

Floods can damage buildings, machinery, inventory, transportation infrastructure, power supplies, and communication systems. They may also force businesses to suspend operations for extended periods while repairs are undertaken.

Organizations located in flood-prone regions often invest in drainage improvements, flood barriers, early warning systems, and emergency response plans to reduce potential losses.

Storms and Tropical Cyclones

Storms, hurricanes, and cyclones can generate extremely strong winds, heavy rainfall, and storm surges capable of causing catastrophic damage.

These events may destroy production facilities, interrupt electricity supplies, damage transportation networks, and delay deliveries to customers.

Insurance costs also tend to increase significantly for organizations operating in high-risk regions affected by recurring storms.

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Comparison of Chronic and Acute Physical Risks

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4. Impact on Infrastructure

Infrastructure forms the foundation of economic activity. Roads, bridges, ports, railways, airports, power grids, telecommunications systems, water networks, and industrial facilities all depend on stable environmental conditions.

Climate hazards increasingly threaten these critical assets.

Flooding may wash away roads and bridges, preventing employees and suppliers from accessing production sites. Heatwaves can cause railway tracks to expand and roads to crack. Rising sea levels threaten ports that facilitate international trade. Extreme storms may damage electricity transmission systems, causing prolonged power outages.

As infrastructure becomes increasingly vulnerable, organizations experience rising maintenance costs, higher insurance premiums, operational delays, and reduced service reliability.

To improve resilience, governments and businesses are investing in climate-resilient infrastructure capable of withstanding future climate conditions rather than relying solely on historical weather patterns.

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5. Impact on Business Operations

Climate risks directly affect day-to-day business activities.

Extreme weather events may force temporary closure of offices, factories, warehouses, and retail outlets. Employees may be unable to reach workplaces due to damaged transport networks, while power outages can halt manufacturing and disrupt digital services.

Long-term climate changes can also affect workforce productivity. High temperatures increase occupational health risks, particularly for employees working outdoors or in facilities without adequate cooling systems.

Operational disruptions often translate into lost revenue, increased operating costs, delayed customer service, contractual penalties, and reputational damage.

Many organizations now incorporate climate adaptation into business continuity planning to minimize disruptions and ensure rapid recovery following climate-related events.

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6. Impact on Supply Chains

Modern supply chains are highly interconnected and often span multiple countries. As a result, climate events occurring in one location can create ripple effects across global production networks.

A flood affecting a semiconductor manufacturing facility may delay electronics production worldwide. Droughts can reduce agricultural yields, affecting food manufacturers and retailers. Hurricanes may temporarily close ports, delaying international shipments and increasing transportation costs.

Climate risks within supply chains are particularly challenging because organizations often have limited control over suppliers’ preparedness and resilience.

To reduce these risks, organizations increasingly:

• Diversify supplier networks.
• Assess suppliers’ climate resilience.
• Increase inventory buffers for critical materials.
• Improve supply chain visibility through digital technologies.
• Collaborate with suppliers on climate adaptation strategies.

Supply chain resilience has become a critical component of enterprise risk management and long-term business sustainability.

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Key Takeaways

Climate hazards are physical climate-related events or trends capable of causing harm, while climate risk refers to the likelihood that these hazards will negatively affect people, assets, or organizations after considering exposure and vulnerability.

Climate risk is determined by the interaction between hazards, exposure, and vulnerability. Organizations can reduce overall risk by limiting exposure, strengthening resilience, and improving adaptive capacity.

Physical climate risks are classified as chronic or acute. Chronic risks develop gradually over time and include sea-level rise, rising temperatures, and water scarcity. Acute risks occur suddenly and include floods, storms, hurricanes, and wildfires.

Physical climate risks have significant implications for infrastructure, business operations, and global supply chains. These impacts can lead to financial losses, operational disruptions, increased maintenance costs, and reduced organizational resilience.

Organizations that proactively assess climate hazards, invest in resilient infrastructure, strengthen operational continuity, and improve supply chain resilience are better positioned to manage climate-related uncertainty and achieve long-term sustainability.