Climate Change Mitigation and Adaptation
Climate change is one of the most pressing global challenges of our time. Continued greenhouse gas emissions, largely driven by the burning of fossil fuels, have raised global temperatures and intensified climate-related risks across the world.
Rising temperatures are already contributing to more frequent and severe heatwaves, changing rainfall patterns, sea-level rise, and increasing pressure on ecosystems and communities. In response, the international community has established targets to limit further warming while also strengthening societies’ ability to cope with climate impacts.
Under the Paris Agreement, countries agreed to pursue efforts to limit the increase in global average temperature to 1.5°C above pre-industrial levels. This target has become an important benchmark for global climate action, but achieving climate resilience requires more than limiting temperature rise alone.
Climate action therefore depends on two complementary approaches: mitigation, which addresses the causes of climate change, and adaptation, which addresses its impacts and consequences.
In this blog, we explore what the 1.5°C target means and why it matters, how mitigation and adaptation work in practice, and why both are necessary for building a more climate-resilient and sustainable future.
What Does 1.5°C Mean and Why it Matters?
The Paris Agreement established the global goal of holding the increase in temperature to well below 2°C above pre-industrial levels, while pursuing efforts to limit warming to 1.5°C. In climate assessments, the period 1850–1900 is commonly used as an approximation of pre-industrial global temperatures.
The 1.5°C threshold refers to an increase in the global average surface temperature, rather than the temperature of a particular country or a single year. Because global temperatures naturally fluctuate from year to year, long-term warming is assessed over multi-year periods. The Intergovernmental Panel on Climate Change (IPCC), for example, assesses global warming levels using 20-year averages.
This distinction is important. A single year exceeding 1.5°C above pre-industrial temperatures does not necessarily mean that the long-term 1.5°C warming level has been crossed.
Global warming is also not distributed evenly around the world. Land generally warms faster than the oceans, while some regions warm considerably faster than the global average. The Arctic, for example, has warmed at nearly four times the global average rate in recent decades. Changes in climate extremes can also be more pronounced than changes in average temperature, contributing to more intense heatwaves, heavy rainfall and other climate-related hazards.
Why does 1.5°C matter?
The 1.5°C target should not be understood as a precise dividing line between a “safe” and a “dangerous” climate. Climate change is already affecting communities and ecosystems, and risks increase progressively with every additional increment of warming.
However, the level of warming still matters enormously. Limiting warming can reduce the severity and likelihood of many climate-related impacts, including extreme heat, heavy rainfall, drought, sea-level rise and ecosystem disruption. Higher levels of warming also increase the likelihood that multiple climate risks will occur simultaneously or interact with existing social, economic and environmental vulnerabilities.
This is why the difference between 1.5°C and higher levels of warming is significant. Every fraction of a degree avoided can reduce future risks, limit potential losses and give communities and ecosystems greater capacity to adapt.
At the same time, limiting warming alone is no longer enough. Climate impacts are already occurring, and some future changes cannot be completely avoided. This is where the two main pillars of climate action—mitigation and adaptation—become particularly important.
Climate Change Mitigation and Adaptation
As many climate impacts are already occurring, and some degree of further change is unavoidable. Effective climate action therefore requires two complementary approaches: climate change mitigation and adaptation.
To put it simply,
Mitigation = limiting how much climate change occurs.
Adaptation = managing the climate change that occurs.
Mitigation
Mitigation seeks to address the causes of climate change by reducing greenhouse gas emissions and increasing their removal from the atmosphere.
Mitigation can take many forms, including transitioning to renewable energy, improving energy efficiency, adopting more sustainable agricultural practices, reducing emissions from transport and industry, and protecting and restoring forests and other carbon-rich ecosystems.
The overall goal of mitigation is to limit the extent of future warming and, in turn, reduce the scale and severity of climate impacts.
Adaptation
Adaptation, meanwhile, addresses the consequences of climate change by helping communities, infrastructure, ecosystems, and economies prepare for and respond to current and future climate risks.
Unlike mitigation, which contributes to limiting global warming, adaptation is highly context-specific. Climate risks differ between countries, regions and communities depending on factors such as geography, exposure, infrastructure, ecosystems and socioeconomic conditions.
Effective adaptation therefore begins with understanding local climate risks and vulnerabilities and identifying appropriate measures to manage them.
Adaptation measures can include developing climate-resilient infrastructure, improving flood and drought management, adjusting agricultural practices and crop choices, strengthening early-warning systems, protecting coastal communities from sea-level rise, and restoring ecosystems that provide natural protection against climate hazards.
Adaptation is not only about responding to impacts after they occur. It is also about anticipating future risks and incorporating climate considerations into decisions made today, so that communities, ecosystems and economies are better prepared for a changing climate.
Why Do We Need Both?
Mitigation and adaptation address different dimensions of climate change, but neither is sufficient on its own.
Mitigation is essential for limiting the magnitude of future warming, while adaptation is necessary to manage the climate impacts that are already occurring or can no longer be avoided.
Without stronger mitigation, global temperatures will continue to rise, increasing the severity of climate risks and making adaptation progressively more difficult. At the same time, even ambitious mitigation cannot immediately eliminate existing climate risks. Communities, infrastructure and ecosystems must therefore continue to adapt to changing conditions.
Importantly, mitigation and adaptation should not always be treated as completely separate areas of climate action. As illustrated below, some measures can create synergies, contributing to both objectives at the same time. For example, restoring forests or mangroves can remove carbon from the atmosphere while also helping reduce exposure to landslides, flooding or coastal hazards. Expanding urban green spaces can similarly help store carbon and reduce the urban heat-island effect.
Source: OECD (2021), Strengthening Adaptation-Mitigation Linkages for a Low-Carbon, Climate-Resilient Future.
However, interactions between mitigation and adaptation can also involve trade-offs. A mitigation measure may increase vulnerability if climate risks are not considered in its planning. For example, energy infrastructure located in areas highly exposed to climate hazards. Conversely, some adaptation measures may increase greenhouse gas emissions; increased reliance on energy-intensive cooling is one example when the electricity used is generated from carbon-intensive sources. Identifying these interactions early can help policymakers and project planners maximise co-benefits while avoiding unintended consequences.
Therefore, effective climate action requires an integrated approach of reducing emissions to limit future warming while simultaneously strengthening the resilience of societies, economies and ecosystems to the changes that are already underway. The IPCC describes this integration of mitigation, adaptation and sustainable development as central to climate-resilient development.
From Climate Action to Project Planning
Mitigation and adaptation are not only matters of national climate policy. They also need to be translated into decisions at the project level, particularly during the early stages of infrastructure planning and feasibility assessment.
A feasibility study provides an important opportunity to consider climate change before major investment and design decisions are finalised. This involves looking at a proposed project from two complementary perspectives:
1) Mitigation: Project → Climate
How can the project reduce or avoid greenhouse gas emissions and support lower-carbon development?
2) Adaptation: Climate → Project
How could current and future climate conditions affect the project, and what measures are needed to strengthen its resilience?
From a mitigation perspective, project planning can identify opportunities to reduce greenhouse gas emissions through decisions related to energy use, construction materials, technologies, transport systems and alternative project designs. Considering these options early can help ensure that infrastructure development is aligned with longer-term low-carbon development objectives.
From an adaptation perspective, climate change impact assessment examines how a project may be affected by changing climate conditions throughout its operational lifetime. Infrastructure planned today may remain in use for several decades, during which rainfall patterns, temperatures, flood levels, sea levels and the frequency or intensity of extreme events may differ considerably from historical conditions.
Climate change impact assessment therefore helps identify relevant climate hazards, assess the exposure and vulnerability of infrastructure and surrounding areas, and translate these risks into practical measures that can be incorporated into project planning and design.
How JHSUSTAIN Applies Climate Change Impact Assessment
At JHSUSTAIN, climate change impact assessment has been incorporated into infrastructure feasibility studies to help translate climate information into practical project-level decisions.
The assessment process typically begins by examining historical climate trends and future climate projections relevant to the project location. Depending on the project, this may include changes in precipitation, extreme rainfall, temperature, flooding, water levels or sea-level rise.
The next step is to assess how these changes could affect the proposed infrastructure and its surrounding environment. This can include potential impacts on bridge foundations, roads, drainage systems, pavement performance and nearby communities.
Climate risks can then be translated into potential adaptation measures for consideration during project planning and design.
For example, climate change impact assessments undertaken for bridge and transport infrastructure projects in Uganda, Cambodia and Pakistan considered different climate risks according to their local contexts.
In Uganda, the assessment considered changes in Lake Victoria water levels, heavy rainfall and flooding, as well as rising temperatures. The findings informed considerations such as higher bridge and foundation design, improved drainage facilities and the use of heat-resistant pavement materials.
In Cambodia, the assessment examined flood levels, river hydraulics, drainage conditions and the safety of existing bridge infrastructure. These findings contributed to bridge planning, drainage improvements along National Road No. 48, pavement rehabilitation and infrastructure safety considerations.
In Pakistan, climate risks assessed for transport infrastructure in Karachi included intense rainfall, urban flooding, extreme heat and exposure to sea-level rise. Potential responses included increased drainage capacity, heat-resilient asphalt and structural protection measures.
These examples primarily demonstrate the adaptation dimension of climate-informed feasibility studies: understanding how a changing climate could affect infrastructure and incorporating appropriate responses before detailed design and construction.
At the same time, the feasibility-study stage can also provide an opportunity to examine the mitigation dimension of a project. Where relevant, alternative technologies, materials, energy systems or design options can be compared in terms of their potential greenhouse gas emissions, allowing lower-carbon options to be considered alongside climate-resilience measures.
Bringing these two perspectives together can help projects address both sides of the climate challenge:
Mitigation asks: How can the project reduce its contribution to climate change?
Adaptation asks: How can the project remain resilient to the climate conditions it will face?
Integrating these considerations during feasibility assessment allows climate action to move from broad policy objectives into practical investment, planning and design decisions. Rather than relying only on historical conditions, infrastructure can be planned with a clearer understanding of both its long-term climate exposure and its potential contribution to a lower-carbon future.
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