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Photo: Oliver Johnson / SEI.

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NDCs+: accelerating country-driven climate action

SEI supports countries in developing and implementing stronger, more integrated national climate plans under the Paris Agreement – helping translate ambition into evidence-based, actionable strategies for a resilient, low-carbon future.

National climate plans under the Paris Agreement

The Paris Agreement established a global framework for tackling the climate crisis by limiting global warming to “well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C” (Article 4, paragraph 2).  To achieve this, countries prepare and regularly update national climate plans that chart their course toward a safer, more sustainable future.

At the core of this global framework to combat the climate crisis are Nationally Determined Contributions (NDCs), which are documents that outline individual countries’ plans to reduce greenhouse gas emissions and adapt to the impacts of climate change. Updated every five years, NDCs are expected to become more ambitious over time, expanding in scope and strengthening implementation across mitigation, adaptation, finance, and loss and damage.

The NDCs are complemented by Long-Term Low Emission Development Strategies (LT-LEDS), which articulate a country’s long-term vision for achieving net-zero emissions and climate-resilient development by mid-century. For enhanced transparency and accountability, Biennial Transparency Reports (BTRs) are submitted to the UNFCCC to track progress under the Paris Agreement.

Together, these instruments form what SEI refers to as NDCs+: a suite of national planning and reporting tools and documents that drive climate ambition, coherence, and implementation.

How SEI supports NDCs+

The urgency of the climate crisis has never been clearer. Record-breaking temperatures, intensifying storms, and compounding climate impacts demand faster, more coordinated, and more equitable action. Countries that deliver strong, integrated, and forward-looking climate plans in the coming years will be best positioned to strengthen resilience, unlock investment, and achieve a just transition to low-carbon development.

Many countries are now preparing the next generation of NDCs and long-term strategies, facing the challenge of making them more ambitious, integrated, and aligned with national development priorities. Governments are under growing pressure to raise ambition and deliver climate plans that connect mitigation, adaptation, and development goals. However, many still struggle with fragmented analyses, siloed institutions, and limited technical and financial capacity, which can constrain ambition and slow implementation.

SEI’s work on NDCs+ helps governments overcome these challenges. Building on decades of experience supporting national climate planning processes across the globe, SEI helps governments translate climate ambition into actionable and evidence-based plans. This work brings together SEI’s global expertise in areas like mitigation, adaptation, loss and damage, just transition, and finance, offering integrated approaches to planning.

SEI’s widely used LEAP tool has supported more than 60 countries in developing the emissions modelling work that underpins their NDCs. Over time, SEI has expanded its family of tools to also account for co-benefits around health, the economy and sustainable development. SEI also provides policy-relevant insights on climate adaptation, loss and damage, carbon trading, and finance, helping countries navigate the complex policy and investment landscape of climate action. This technical and analytical expertise is complemented by participatory policy engagement, ensuring that strategies reflect national priorities. The focus goes beyond preparing science-based plans; SEI strives to enable effective implementation, capacity building, and investment for climate action.

Leveraging advanced modeling tools, systems analysis, and participatory policy processes, SEI helps countries design integrated climate and development plans that align climate action and sustainable development. Misalignment between climate and development policies remains a widespread challenge; SEI works at the nexus of these issues, supporting governments to identify trade-offs, capture synergies, and ensure coordination across sectors.

Through its Initiative on Integrated Climate and Development Planning, SEI supports low- and middle-income countries in linking their NDCs with the Sustainable Development Goals. Using tools such as LEAP, NEMO, WEAP, and AMES, SEI conducts integrated assessments that link mitigation, adaptation, and economic outcomes, providing governments with a solid evidence base for decision-making. SEI’s NDC-SDG Connections tool enhances transparency and comparability among countries’ commitments, and its experts have drawn lessons from global NDC experience to inform best practices.

With the third cycle of NDC submissions in 2025, countries are expected to increase their ambition, though ambition alone is not enough. To effectively limit global warming to 1.5°C above pre-industrial levels, NDCs must also be coherent, actionable, and implementable.

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SEI supports governments in developing integrated, economy-wide greenhouse gas (GHG) emissions mitigation strategies. Using SEI’s flagship tools – the Low Emissions Analysis Platform (LEAP) and the Next Energy Modeling system for Optimization (NEMO) – SEI helps countries build customized emissions models covering energy, transport, industry, buildings, waste, agriculture, forestry, and other land uses.

These models enable governments to assess emissions trajectories, costs, financing needs, and abatement potential under various scenarios, from business-as-usual to ambitious decarbonization pathways. By combining quantitative analysis with participatory policy engagement, SEI ensures that mitigation options are technically sound, nationally relevant, and aligned with social and development priorities.

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Adaptation to climate change is a core focus of SEI’s research and engagement. SEI supports countries in strengthening climate resilience and adaptive capacity through integrated analysis of climate risks, vulnerabilities, and response options.

SEI’s work covers adaptation policy and finance under the UN Framework Convention on Climate Change, vulnerability assessments, capacity building, and community-based adaptation. Drawing on literature reviews, stakeholder consultations, and participatory processes, SEI identifies priority adaptation measures across key sectors such as water, agriculture, and health, identifying gaps in financial support while also exploring the links between mitigation and adaptation outcomes. The institute’s approach emphasizes the integration of adaptation into national and sectoral strategies, and evidence-based prioritization of actions that enhance resilience for vulnerable populations and ecosystems.

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As an established thought leader on operationalizing the loss and damage fund, SEI provides technical and policy support to help governments understand, assess, and address loss and damage (L&D) associated with climate impacts. This includes assessments of economic and non-economic losses, identification of the most affected sectors and communities, and review of policy and financial mechanisms for addressing L&D.

SEI draws on emerging international frameworks, methodologies, and case studies to help countries quantify impacts, identify recovery needs, and develop strategies to access and mobilize finance for addressing residual climate risks.

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SEI works with governments to design just and inclusive transition strategies that ensure climate action delivers equitable social and economic outcomes. Through socioeconomic assessments, policy reviews, and capacity-building, SEI analyzes the impacts of decarbonization on workers and communities, identifies policy gaps and financing options for affected sectors, and provides recommendations for labor reskilling and regional economic diversification.

SEI’s approach promotes social inclusion, gender equality, and youth engagement by identifying targeted actions to involve vulnerable populations in decision-making and to strengthen their capacity to participate in climate action.

Our work also supports the integration of gender considerations into climate finance and policy planning, ensuring equitable access to opportunities and resources. In addition, SEI can review and provide recommendations to strengthen institutional arrangements for effective climate governance, enhancing coordination across ministries, agencies, and the private sector. Across all activities, SEI embeds cross-cutting themes – such as gender equality, just transition, and social inclusion – into mitigation and adaptation planning to advance fair and resilient low-carbon development.

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SEI assists governments in developing climate finance strategies that align with national priorities and international best practices. This includes mapping existing finance flows across public, private, and international sources; identifying financing gaps and opportunities; and assessing suitable finance mechanisms to advance mitigation and adaptation actions.

SEI also supports countries in evaluating strategies to mobilize resources through Article 6 cooperation and international carbon markets, linking climate actions with innovative financial instruments and partnerships. By strengthening countries’ capacity to attract and manage climate finance, SEI enables them to unlock new investment opportunities for low-carbon development.

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SEI is widely recognized for helping countries integrate air quality and climate strategies, and for its expertise in quantifying associated health and air pollution co-benefits. Working with the Climate and Clean Air Coalition, SEI is supporting more than 70 countries in Africa, Asia and Latin America to identify actions that can enhance air quality, improve human health, and mitigate climate change.

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SEI’s work demonstrates specific measures that countries can take to phase out fossil fuel production, and how these can be integrated into NDCs and development strategies. It also focuses on how to manage the fossil-fuel transition equitably.

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Industry is responsible for emitting 30% of global CO2 emissions, making it a crucial player in global efforts to mitigate climate change. However, so far, most NDCs lack details around how countries plan to cut emissions from industry. SEI is working to address this gap by undertaking collaborative projects with countries and industry to cut emissions in the private sector.

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Leadership team

Silvia Calderón

Centre Director

SEI Latin America

Charles Heaps

Senior Scientist

SEI US

2018 portrait of jason veysey
Jason Veysey

Energy Modeling Program Director and Senior Scientist

SEI US

Katy Harris
Katy Harris

Senior Policy Fellow

SEI Headquarters

Maya Rebermark
Maya Rebermark

Senior Expert in Climate Communications and Impact

Communications

SEI Headquarters

NDCs+ network

Diane Archer

Senior Research Fellow

SEI Asia

Derik Broekhoff

Senior Scientist

SEI US

Lynsi Burton

Communications Officer

Communications

SEI US

Daniel Ddiba
Daniel Ddiba

Research Fellow

SEI Headquarters

Daniel Duma
Daniel Duma

Senior Research Fellow

SEI Headquarters

Adis Dzebo
Adis Dzebo

Senior Research Fellow

SEI Headquarters

2018 portrait of Emily Ghosh
Emily Ghosh

Equitable Transitions Program Director

SEI US

Andreas Hoy

Senior Expert (Climate Systems and Energy Policy Unit)

SEI Tallinn

Profile picture of Annette Huber-Lee
Annette Huber-Lee

Senior Scientist

SEI US

Richard J.T. Klein
Richard J.T. Klein

SEI Affiliated Researcher

SEI Oxford

Johan C. I. Kuylenstierna

Professor

SEI York

Chris Malley

Senior Research Fellow

SEI York

Eleni Michalopoulou

SEI Affiliated Researcher

SEI York

Cassilde Muhoza

Research Fellow

SEI Africa

Miquel Muñoz Cabré

Senior Scientist

SEI US

Connie O’Neill

Research Associate

SEI York

Åsa Persson
Åsa Persson

Senior Research Fellow

SEI Headquarters

Cleo Verkuijl
Cleo Verkuijl

Senior Scientist

SEI US

Robert Watt
Robert Watt

Engagement Director

SEI Headquarters