http://dx.doi.org/10.17176/20251203-172053-0 https://verfassungsblog.de/differentiation-of-responsibilities-in-the-icjs-climate-advisory-opinion/ Cooperation Without Justice? - On the Elusive Differentiation of Responsibilities in the ICJ’s Climate Advisory Opinion Petel, Matthias eng 2025-11-03 electronic resource text/html ddc:342 Advisory Opinion Climate Crisis ICJ Verfassungsblog Verfassungsblog--2366-7044 CC BY-SA 4.0 The ICJ’s advisory opinion insists heavily on the duty to cooperate to protect the climate system. I show that this duty of cooperation is grounded in an acknowledgment of differentiated obligations among states but falls short in specifying how those differentiated obligations should be quantified, whether in relation to mitigation or to adaptation finance. I argue this reflects a general reluctance to engage with the distributive issues central to climate justice claims which, in turn, serves to preserve the ICJ legitimacy.