Background

The Quest for Atmospheric Water — International Colloquium

On 8–9 October 2026, the Geneva Water Hub joins forces with the Collège de France for an international colloquium on atmospheric water — a resource increasingly targeted by capture technologies, yet still overlooked by international law.
CoF
August, 10th 2026 - September, 10th 2026
Collège de France
Amphithéâtre Mireille Delmas-Marty
11, place Marcelin-Berthelot
75005 Paris, FRANCE

Cloud seeding, fog nets, atmospheric river modification: technologies to capture water from the sky are multiplying, while international law still struggles to grasp this invisible, borderless resource. Who does it belong to? Who may capture, divert or regulate it?

Under the scientific direction of Professor Laurence Boisson de Chazournes (University of Geneva / Geneva Water Hub) and Professor Thomas Römer (Administrator of the Collège de France), the colloquium brings together legal scholars, philosophers, historians, ethnographers and theologians around four panels exploring the legal invisibility of atmospheric water, the logics of its control, the frameworks governing its exploitation, and the ethical limits of its capture.

The Geneva Water Hub is actively engaged in the event: Mara Tignino, Lead Legal Specialist, will moderate the panel "Controlling Atmospheric Water" and speak on the modification of the environment in public international law.

👉 Free entry, subject to seat availability
🔗 Full programme: Collège de France

Main partners: 

Collège de France

Fondation Hugot du Collège de France

University of Geneva (Faculty of Law) 

Fondation Pierre et Laura Zurcher

Geneva Water Hub

Download the full program