Many of the measures on quantifying progress by countries towards reducing income inequality have focused on indices that measure trends in inequality over time (Gini coefficient for example) and compare countries without considering the differences between their socioeconomic structures.

However, these indices do not paint the complete picture about how countries are performing, especially when compared to one other in achieving Sustainable Development Goals and what policies and investments may be needed to support them. This research project will provide an alternative measurement of income inequality by taking into account the developing countries’ structural or predetermined conditions (mineral assets, type of institutions etc.) in assessing their progress towards reducing inequality and the impacts of climate change. 

The project focuses on the following objectives: 

1. Firstly, it will compare each country with its potential to reduce income inequalities by measuring the scope for improvement for each country at every year. This will allow a better understanding of the key factors that hinder a country’s effort and performance in reducing inequalities and of the policy and investments that are needed to tackle inequalities more efficiently.
2. Secondly, it will investigate how climate – temperature, precipitation and extreme weather events– influence the efficiency of countries in combining inputs to reduce inequality.
3. Thirdly, it will look at adaptation or intensification effects across regions, particularly in LDCs and SIDS and will identify the needed scale of investments.

Building on a panel database on 145 countries, including countries from Least Developed Countries (LDCs) and Small Island Developing States (SIDS) from 2000-2020, the project will use a stochastic frontier approach, an economic modelling technique, to estimate feasible frontiers for income inequality for each country and year.

You will find below the research paper related to this project:

• Reducing Inequalities Despite Climate change? Rethinking Progress Towards Reducing Income Inequalities and the Impact of Climate Change in Developing Countries

Public actors need to monitor the state of the environment in order to assess the effectiveness of their actions, prioritize management policies and measures, and thus objectively establish their contribution to the conservation of natural capital. To do so, they must be able to rely on science-based standards to identify the thresholds at which environmental functions can be considered sustainable.

The ESGAP (Environmental Sustainability Gap) is an innovative tool for assessing the condition of a territory’s environmental functions and how sustainable they are. For all critical components of natural capital in the territory concerned (air or water quality, pollution, forest resources, fisheries, etc.), this indicator calculates the difference between their current state and a state that would be sustainable (i.e., a state compatible with the sustainable functioning of the processes necessary for the preservation of life, human activities and well-being). This allows for the calculation of the “environmental sustainability gap”, which highlights the path to environmental sustainability. This can then serve as a guide for public policies to estimate and preserve the critical functions of the natural capital of a given territory. ESGAP has already been tested in New Caledonia, Kenya and Vietnam.

Within the framework of the ECOPRONAT research programme, AFD aims to develop methodologies for assessing strong sustainability, that is, adopting demanding criteria concerning the non-substituability of natural capital by other forms of capital (physical among others) in a territory or country. AFD also wants to promote their use in international frameworks and contribute to emerging international standards on the good ecological state of ecosystems.

Find out more about ECOPRONAT

Building on the previous work of University College London (UCL) on the application of ESGAP in countries of the Global South, this research project led by UCL aims to implement the ESGAP framework in Colombia and South Africa. It will test its relevance in fostering public policy dialogue in these two countries that already have a regulatory framework and natural resources management, but where not all data on biodiversity is available. 

More specifically, this project has four objectives: 

1. Developing the ESGAP components related to biodiversity and the state of ecosystems that could be used by Colombian and South African governments, and promoting the use of science-based targets for ecosystem maintenance;
2. Promoting reflection on strong sustainability in Colombia and South Africa through the ESGAP framework, by assessing whether the activities carried out in these countries are within the safe operating space for humanity;
3. Clarifying how the ESGAP framework aligns, complements and adds value to other types of existing sustainability indicators that national governments are already using;
4. Strengthening the capacity of partner countries to implement the ESGAP framework beyond this research project. 

The ESGAP framework is based on a dashboard that provides information on changes in the functional state of 23 components of the environment, focusing on the gaps that exist between these changes and the objectives of maintaining or achieving a "good environmental state". These components cover the 4 main categories of critical and essential environmental functions: resource provision, pollution reprocessing, biodiversity and human health. The scores for each of the twenty-three components are then aggregated to form a synthetic indicator and a dynamic indicator.

The research activities in the two pilot countries is carried out by researchers from Stellenbosch University (South Africa) and the National University of Colombia (UNAL). Capacity building will include training four postgraduate students as well as awareness-raising activities targeting policymakers and other stakeholders, in order for them to take ownership of the ESGAP and use it during public policy formulation.

The research teams will produce scientific papers on the relationship between the ESGAP framework and other sustainability indicator initiatives, as well as on the work and calculations of the ESGAP indicators carried out in each country, comparing the cases of Colombia and South Africa. A specific report will be produced on indicators of the state of biodiversity and ecosystems as well as the identification of data sources for the two countries studied.

In addition, an international workshop will be organized to present the complementarities between the ESGAP framework and relevant initiatives of existing sustainability indicators.

Finally, the research team intends to produce several documents for decision-makers and public policy actors:

• A summary of the review of biodiversity indicators and the state of ecosystems, which may be useful for negotiations at the Conferences of the Parties (COPs) to the Convention on Biological Diversity and for the design of national biodiversity strategies and action plans (NBSAPs);
• A webinar with a webinar report on the relationship between the ESGAP framework and other international sustainability reporting initiatives;
• A summary for decision-makers in each partner country on the rationale of the strong sustainability development approach and the methodology and ESGAP indicators that enable it to be implemented.

Download the publications related to the project: 

• The SDGs Provide Limited Evidence That Environmental Policies Are Delivering Multiple Ecological and Social Benefits, Earth's Future vol.12 (May 2024)
• Enhancing Environmental Sustainability Through the Environmental Sustainability Gap (ESGAP) Framework in Colombia, Policy Dialogues n°67, Editions Agence française de développement (October 2024)
• Strong sustainability in the SEEA and the wider indicator landscape, One Ecosystem (May 2025)
• Assessing environmental sustainability in Colombia: Metrics and policy recommendations, Environmental and Sustainability Indicators n°27 (September 2025)

A "Research Conversations" webinar presented the results of the articles to the scientific community in November 2024: