Pathways Designer by the DDP logo 1

By the DDP

Designing pathways for
real-world decarbonization

Designing pathways for real-world decarbonization

Countries around the world have set ambitious climate targets. The challenge now is turning those ambitions into realistic, implementable pathways that reflect national priorities, development objectives, and local realities.

Countries around the world have set ambitious climate targets. The challenge now is turning those ambitions into realistic, implementable pathways that reflect national priorities, development objectives, and local realities.

Unlike conventional emissions calculators, the Pathways Designer does more than estimate future emissions. It helps users explore how transformations can happen in practice, identify the key drivers of change across sectors, test alternative strategies, and understand the implications of different policy choices.

Designed to work in a wide range of national contexts—including those with limited modelling capacity—the tool supports governments, research teams, and development partners in building pathways that are not only ambitious, but grounded in the economic, social, and institutional realities of implementation.

Whether used as a standalone pathway design tool or alongside more sophisticated models, the Pathways Designer provides a structured framework for turning climate ambition into actionable strategies for long-term transformation.

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FAQ

General questions



What is the Pathways Designer?

A practical tool to design credible, country-specific decarbonization pathways. The tool allows capturing insights from domestic experts and stakeholders, synthetize them in structured qualitative storylines and translate them in quantified metrics.A practical tool to design credible, country-specific decarbonization pathways. The tool allows capturing insights from domestic experts and stakeholders, synthetize them in structured qualitative storylines and translate them in quantified metrics.



What problem does it solve?

It bridges the gap between climate targets and implementable strategies, helping translate ambition into detailed  pathways connecting the short-term with long-term goals, and informing concrete decisions with robust evidence anchored in the reality of each country. It does so by adopting a detailed sectoral breakdown and describing the key drivers of concrete transformations compatible with ambitious climate targets and domestic socio-economic priorities



What makes this tool different from others?

  • Designed for use by a diversity of country actors, including  modellers but also national research teams, government analysts, and expert partners working on climate strategy and planning
  • Combines qualitative storylines with quantified data, allowing the exploration of a diversity of drivers of change, including organizational, structural and behavioral dimensions (beyond limitations imposed by modelling tools)
  • Covers whole-economy transformation with high sectoral resolution
  • Works in low-data environments thanks to the possibility to select different modes corresponding to different levels of detail in the analysis according to available data and expertise



What sectors does it cover?

It covers all major emitting sectors, including:

  • Energy and power
  • Transport
  • Industry
  • Buildings
  • Agriculture, forestry, and land use
  • Waste



Is it a calculator or a decision-support tool?

It is not just a calculator—it is a decision-support tool designed to help countries build realistic and implementable pathways to net zero.

Beyond calculating emissions, the Designer supports policy discussions by:

  • Making transformation choices explicit. The level of sectoral detail allows users to identify and discuss the key drivers of change—such as technology deployment, infrastructure development, behavioural shifts, or industrial transformation—that are often at the centre of policy debates.
  • Connecting qualitative visions with quantitative outcomes. The DDP approach starts from narratives describing how the transition could happen in practice, including economic, social, institutional, and political dimensions. This allows users to explore questions that matter to policymakers, not only those that are easiest to model.
  • Testing alternative pathways. Users can quickly explore different assumptions and policy choices, helping reveal the implications, trade-offs, and conditions required for different transition strategies.
  • Supporting dialogue and consensus-building. By making assumptions transparent and translating them into measurable outcomes, the Designer provides a common framework for discussion between government agencies, researchers, development partners, businesses, and civil society.

The objective is not simply to calculate emissions trajectories, but to support informed decisions about how a country’s transition can be achieved in practice.

For potential users and partners



Who can use the Pathways Designer?

National research teams, government analysts, and expert partners working on climate strategy and planning.



What is expected from a partner team?

  • Data collection
  • Lead the pathway development process, including collecting and validating national data, defining transition storylines, identifying sectoral transformation levers, engaging the set of relevant domestic experts , and defining the set of relevant scenarios for an exploration of the range of possible futures
  • Engage relevant national stakeholders to ensure policy relevance and broad domestic ownership of the scenarios
  • Work collaboratively with the DDP team, when needed, including engaging in technical conversations and knowledge sharing processes with partner teams operating in other countries



What support does DDP provide?

  • Technical guidance on using the tool
  • Support in scenario design, including the development of transition narratives, identification of key transformation levers, and selection of assumptions
  • Access to international benchmarks and examples from other national pathways to help inform assumptions and explore different transition strategies
  • Expert review of pathway design choices, assumptions, and results to strengthen consistency and credibility
  • Guidance for the organization of stakeholder engagement and policy dialogue throughout the pathway development process and ad-hoc support for facilitation if useful



Do users need advanced modelling expertise?

No. The tool is designed to be accessible, with different levels of complexity depending on user needs.



Can it work alongside existing models?

Yes.

The Pathways Designer can be used as a complementary tool alongside more complex modelling approaches. It helps structure and compare transition pathways, define key assumptions, and develop coherent scenarios that can subsequently be assessed using detailed energy system, macroeconomic, or sectoral models.

At the same time, in contexts where such models are not available—or where modelling capacity and data are limited—the Designer enables teams to develop robust pathway analyses without requiring more sophisticated analytical tools.

This flexibility makes it suitable both as:

  • A pathway design and scenario-framing tool for countries with advanced modelling capabilities; and
  • A standalone pathway development tool for countries with more limited modelling resources.



What kind of data is required?

The Designer relies primarily on national data gathered and consolidated by the country team from existing sources such as official statistics, sectoral databases, policy documents, and research studies. The DDP provides benchmarks and international references to help inform assumptions, validate results, and address data gaps where needed. The amount and nature of required data depends on the choices made by the user regarding the granularity of the representation for each component of the pathway

For potential funders



Why is this tool needed now?

Countries have targets, but often lack practical tools to design implementable pathways, especially in low-capacity contexts.



What value does it bring to funded projects?

  • More credible and realistic pathways
  • Greater country ownership and uptake
  • Enhanced bridge between science and policy



Where can it be deployed?

Particularly suited for:

  • Emerging and developing countries
  • Low-data environments
  • Contexts with limited modelling capacity



How scalable is it?

Highly scalable:

  • Standardised framework across countries
  • Flexible to different national contexts
  • Applicable across sectors and timelines



What can funding support?

  • Deployment in new countries (pilot projects)
  • Tool development and refinement
  • Capacity building by the DDP Initiative for national teams
  • Strategic partnerships and integration into planning proncesses



Why fund the DDP Designer when other modelling tools already exist?

The value of the DDP Designer is not to replace existing models, but to help countries design credible and implementable pathways that can inform policy and investment decisions.

By combining country ownership, stakeholder engagement, qualitative narratives, and quantitative analysis, it provides a concrete tool to equip countries with the capacity to understand how the transition can realistically be achieved in a specific national context.

As such it addresses a critical gap that many modelling tools leave unanswered. It can work complementarily with existing models by ensuring that models are used to inform a story that would be primarily designed according to a policy vision instead of using models to tell the story by themselves

Get in touch

For more information or to explore collaboration opportunities, please contact us :

Henri Waisman

Henri Waisman

Director, Deep Decarbonization Pathways programme