Mitigating and Adapting to climate change has become increasingly important for Indonesia as extreme weather, water crises, and other climate-related impacts become more visible. One of the most serious threats for Indonesia as an archipelagic country is sea level rise.
Indonesia has thousands of islands and extensive coastal areas where millions of people live and work. As sea levels rise, coastal settlements, infrastructure, economic activities, freshwater resources, and ecosystems may face increasing pressure.
Mitigating and Adapting Sea level rise is therefore not only an environmental issue. It is also connected to economic resilience, food security, public infrastructure, disaster risk, coastal livelihoods, and national development.
Projections toward the end of this century indicate that sea levels will continue to rise as the climate warms. The magnitude of future sea level rise will depend on global greenhouse gas emissions, ocean warming, melting glaciers and ice sheets, and local conditions such as land subsidence.
For Indonesia, cities such as Jakarta, Surabaya, and Semarang are particularly important because many coastal areas already experience tidal flooding, shoreline change, and land subsidence.
The potential impacts are significant. Residential areas and infrastructure may face more frequent flooding, while coastal erosion and seawater intrusion can affect land and freshwater resources.
Economic sectors such as fisheries, ports, tourism, transportation, and coastal industries may also experience disruption.
For low-lying islands and coastal zones, long-term sea level rise may even affect the physical geography of certain areas, making climate resilience an important component of national planning.
Mitigating and Adapting to Sea Level Rise in Indonesia
Mitigating and Adapting are two complementary approaches to climate change.
Mitigation focuses on reducing greenhouse gas emissions or increasing carbon removal in order to limit the magnitude of future climate change.
Adaptation focuses on reducing vulnerability and preparing communities, infrastructure, ecosystems, and economic activities for climate impacts that are already occurring or are expected in the future.
For sea level rise, Indonesia needs both approaches.
Reducing greenhouse gas emissions can contribute to global efforts to slow future warming and sea level rise, while adaptation measures can help coastal communities manage risks that cannot be completely avoided.
Indonesia’s Commitment under the Paris Agreement
Indonesia has actively participated in international climate negotiations under the United Nations Framework Convention on Climate Change (UNFCCC).
The Paris Agreement, adopted in 2015, strengthened global cooperation to limit climate change and encouraged countries to communicate their climate targets through Nationally Determined Contributions (NDCs).
An NDC outlines a country’s planned contribution to greenhouse gas mitigation and climate adaptation.
Indonesia submitted its first NDC in 2016 and subsequently strengthened its climate commitments.
Indonesia’s Enhanced NDC included a greenhouse gas emission reduction target of 31.89% through national efforts and up to 43.20% with international support by 2030 compared with the relevant baseline scenario.
These commitments involve several major sectors, including energy, forestry and other land use, agriculture, waste, and industrial processes.
Why Climate Mitigation Matters for Sea Level Rise
Sea level rise is closely linked to global warming.
As the climate warms, seawater expands because of increasing ocean temperatures. At the same time, glaciers and large ice sheets lose mass and contribute additional water to the ocean.
Reducing global greenhouse gas emissions is therefore important for limiting long-term sea level rise.
For Indonesia, climate mitigation can include accelerating renewable energy deployment, improving energy efficiency, reducing deforestation, restoring ecosystems, improving waste management, and developing lower-carbon transportation.
These measures cannot immediately reverse sea level rise, but they contribute to global efforts to reduce future climate risks.
RPJMN and Climate Resilience
Environmental sustainability, disaster resilience, and climate change were important elements of Indonesia’s National Medium-Term Development Plan, or Rencana Pembangunan Jangka Menengah Nasional (RPJMN) 2020–2024.
The development agenda included programs related to environmental quality, disaster resilience, climate mitigation, and greenhouse gas emission reduction.
These programs demonstrated that climate policy needs to be integrated into development planning rather than treated as a separate environmental issue.
Rehabilitation of degraded ecosystems, emission reduction programs, disaster preparedness, and community capacity building all contribute to creating more resilient development.
Mitigating and Adapting through Renewable Energy
Energy transition is an important component of climate mitigation.
Reducing reliance on fossil fuels and increasing the use of renewable energy can lower greenhouse gas emissions from electricity generation, industry, buildings, and other activities.
Indonesia has significant renewable energy potential from solar, geothermal, hydropower, wind, bioenergy, and other sources.
Energy efficiency is also important because reducing unnecessary energy consumption can lower emissions while improving economic efficiency.
In coastal cities, cleaner energy systems can complement adaptation investments and contribute to broader climate resilience strategies.
Controlling Deforestation and Protecting Carbon Sinks
Forests and coastal ecosystems can store significant amounts of carbon.
Preventing deforestation and protecting ecosystems such as mangroves can therefore support climate mitigation while simultaneously providing adaptation benefits.
Mangrove forests are particularly valuable because they store carbon in vegetation and sediments while also helping stabilize coastlines.
This creates a strong connection between mitigation and adaptation.
Protecting mangroves can help preserve carbon stocks while reducing coastal erosion and strengthening the resilience of coastal communities.
Coastal Infrastructure for Climate Adaptation
Adaptation to sea level rise requires infrastructure that can withstand changing coastal conditions.
Coastal protection may include seawalls, dikes, polders, pumping systems, elevated infrastructure, improved drainage, retention areas, and flood-resistant buildings.
However, engineered infrastructure should be planned carefully because coastal systems are complex.
A seawall that protects one location may influence sediment movement or water flow elsewhere.
For this reason, coastal infrastructure planning should be based on scientific data, long-term climate projections, local land subsidence, hydrology, and environmental conditions.
Nature-Based Solutions for Sea Level Rise
Nature-based solutions can complement conventional coastal infrastructure.
Mangroves, wetlands, seagrass ecosystems, dunes, and other natural coastal features can reduce wave energy, trap sediment, support biodiversity, and strengthen shoreline resilience.
Unlike conventional structures, healthy ecosystems can provide several benefits simultaneously.
Mangrove conservation, for example, can support carbon storage, fisheries, biodiversity, coastal protection, and community livelihoods.
Combining natural and engineered approaches can create more flexible and sustainable coastal adaptation strategies.
Mangrove Conservation and Rehabilitation
Mangrove conservation is one of the important strategies for Mitigating and Adapting to climate change in Indonesia’s coastal regions.
Mangrove roots help stabilize sediment and reduce erosion while creating habitats for fish, crustaceans, birds, and other species.
Mangrove ecosystems also store significant quantities of carbon, particularly in coastal soils and sediments.
Restoration programs should therefore focus not only on planting trees but also on restoring suitable hydrology, sediment conditions, tidal flows, and ecosystem functions.
Protecting existing healthy mangrove ecosystems is equally important because mature ecosystems may contain large carbon stocks accumulated over long periods.
Coral Reefs and Coastal Resilience
Coral reefs are another important component of coastal protection.
Healthy reef structures can reduce wave energy before it reaches the shoreline, helping protect coastal environments from erosion and strong waves.
Coral reefs also support fisheries, tourism, and marine biodiversity.
However, rising ocean temperatures, pollution, ocean acidification, destructive fishing practices, and other pressures threaten reef health.
Reducing local environmental pressures can improve the ability of coral reef ecosystems to cope with climate-related stress.
Seagrass Ecosystems and Blue Carbon
Seagrass meadows provide another important coastal ecosystem service.
They can store carbon in vegetation and marine sediments while providing habitat and nursery areas for marine organisms.
Protecting seagrass ecosystems can therefore contribute to blue carbon strategies, biodiversity conservation, and coastal ecosystem resilience.
Integrated coastal management should consider mangroves, seagrass, coral reefs, wetlands, and other habitats as interconnected components of coastal landscapes.
Relocation and Spatial Planning in High-Risk Areas
In locations facing very high long-term climate risks, infrastructure protection may not always be sufficient.
Spatial planning can help prevent additional development in areas that are highly exposed to flooding, erosion, or future sea level rise.
In some cases, carefully planned relocation or managed retreat may become necessary.
Such decisions are complex because relocation affects housing, livelihoods, social networks, land rights, culture, and local economies.
Any relocation program should therefore involve affected communities and provide appropriate social, economic, and infrastructure support.
Addressing Land Subsidence in Coastal Cities
Sea level rise is not the only factor increasing coastal flood risks in Indonesia.
In some major cities, land subsidence can make relative sea level rise significantly more severe.
Groundwater extraction, soil characteristics, construction loads, and other factors can contribute to subsidence.
Addressing groundwater management and improving access to reliable piped water can therefore become an important part of coastal climate adaptation.
Monitoring land movement through satellite technology, GPS measurements, and other geospatial methods can also improve risk assessment.
Research and Development for Climate Adaptation
Research and development for Mitigating and Adapting are essential for improving Indonesia’s response to sea level rise.
Scientists need reliable information about coastal elevation, ocean conditions, land subsidence, wave patterns, ecosystem changes, population exposure, infrastructure vulnerability, and future climate scenarios.
Satellite imagery, drones, Geographic Information Systems (GIS), oceanographic monitoring, and climate models can help improve understanding of coastal risks.
Better scientific information allows governments to prioritize adaptation investments and avoid costly infrastructure decisions based on incomplete data.
Early Warning Systems and Disaster Preparedness
Climate adaptation also requires stronger early warning systems and emergency preparedness.
Coastal communities need timely information about extreme weather, tidal flooding, storm surges, and other hazards.
Early warning systems should be connected to clear evacuation plans, emergency communication, shelters, and community training.
Prepared communities can respond more quickly and reduce potential losses when coastal hazards occur.
Protecting Fisheries and Coastal Livelihoods
Sea level rise and other climate impacts can affect fisheries and coastal livelihoods.
Changes in coastal ecosystems, seawater temperatures, salinity, and marine habitats may influence fish populations and aquaculture productivity.
Adaptation strategies should therefore consider the economic needs of fishers, aquaculture operators, tourism businesses, and other coastal communities.
Diversifying livelihoods, strengthening sustainable fisheries management, improving access to climate information, and supporting ecosystem conservation can increase economic resilience.
International Cooperation for Mitigating and Adapting
Climate change is a global problem, and effective Mitigating and Adapting efforts require international cooperation.
Indonesia can benefit from cooperation in climate finance, technology transfer, scientific research, capacity building, renewable energy, ecosystem restoration, and disaster risk management.
International partnerships can also help strengthen climate monitoring systems and support major adaptation projects that require significant long-term investment.
At the same time, Indonesia’s experience as a large archipelagic country can provide valuable lessons for other countries facing similar coastal climate risks.
Multi-Stakeholder Collaboration for Climate Resilience
Government action alone will not be sufficient to address sea level rise.
Businesses, communities, universities, researchers, environmental organizations, and other stakeholders also have important roles.
The government can establish regulations, infrastructure programs, climate policies, and spatial planning for Mitigating and Adapting.
The private sector can contribute financing, innovation, technology, low-carbon investment, and resilient infrastructure.
Universities and research institutions can provide climate science, risk assessments, monitoring systems, and technological innovation.
Communities can contribute local knowledge, environmental monitoring, ecosystem protection, and disaster preparedness.
Monitoring the Effectiveness of Mitigating and Adapting
Climate programs should be monitored regularly to determine whether they are achieving their objectives.
For mitigation, indicators can include greenhouse gas emissions, renewable energy deployment, forest cover, and energy efficiency.
For adaptation, indicators can include flood exposure, coastline changes, ecosystem condition, infrastructure resilience, community preparedness, and economic losses caused by climate hazards.
Monitoring helps identify programs that are working well and areas where policies need to be adjusted.
Transparent data can also improve accountability and public confidence in climate programs.
Building a Climate-Resilient Indonesia
Mitigating and Adapting Sea level rise represents one of the most significant long-term climate challenges facing Indonesia.
As an archipelagic country with extensive coastal settlements and economic activities, Indonesia needs to combine greenhouse gas mitigation with comprehensive adaptation strategies.
Mitigating and Adapting to sea level rise requires renewable energy, emission reduction, forest protection, resilient infrastructure, ecosystem conservation, improved spatial planning, disaster preparedness, research, and international cooperation.
No single solution will be sufficient.
Coastal protection needs to combine engineering, ecosystem-based approaches, social planning, scientific research, and community participation.
Long-term policies also need to account for changing climate conditions and local factors such as land subsidence.
Through strong cooperation among government institutions, businesses, communities, academics, and international partners, Indonesia can strengthen national resilience and reduce the risks associated with sea level rise.
Ultimately, consistent action on both mitigation and adaptation will be essential to protect Indonesia’s coastal regions, economic activities, ecosystems, and future generations from the growing impacts of climate change.