Guillaume POTTIER
Program Director – Climate and Development FinanceGuillaume joined I4CE in 2025 to oversee the institute’s work on climate and development finance at the international level.
Before joining I4CE, Guillaume worked for 7 years at the French Ministry for Europe and Foreign Affairs. Initially in charge of the strategic and operational management of the French Development Agency (AFD), he contributed to raising AFD’s climate ambitions and aligning it with the objectives of the Paris Agreement. From 2022 to 2024, he joined the cabinet of the French Secretary of State for Development and International Partnerships, as technical advisor and then deputy chief of staff. He was notably in charge of the French development policy and budget; he also managed France’s partnerships with developing countries to fight climate change.
Guillaume is a graduate of Sciences Po Paris and the London School of Economics in economics and international relations. He also studied history at the Sorbonne (Paris IV).
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28/11/2025
Foreword of the week
COP30: The missed turn to implementation – and the coalitions moving ahead anyway
COP30 concluded with an agreement, proving that multilateralism is still alive. However, the results are underwhelming: no push to transition away from fossil fuels, no decision on deforestation, and mixed outcomes on adaptation metrics. On climate finance, Belém failed to shift from ambition to implementation. Negotiations quickly drifted back to a battle on yet another high-level quantitative target. The decision to triple adaptation funding by 2035 disappointed many, with its distant time horizon, lack of baseline and non-binding wording. COP30 also missed the opportunity to engage with – and build consensus around – concrete measures outlined in the Baku to Belém roadmap to get to $1.3 trillion. Instead, it defaulted to launching new processes – a work programme on climate finance and a ministerial roundtable on the NCQG. -
13/11/2025
Climate Report
How solidarity levies can help bridge the climate and development finance gap
The climate and development finance gap is large and widening, as Official Development Assistance (ODA) declines and needs multiply. With shrinking fiscal space in vulnerable countries, solidarity levies are gaining attention as a predictable source of international finance. Launched at COP28 by Barbados, France, and Kenya, the Global Solidarity Levies Task Force (GSLTF) is the main initiative in this space.