  As our submission for track three of the AI for Global Climate Cooperation
(AI4GCC) competition, we propose a negotiation protocol for use in the RICE-N
climate-economic simulation. Our proposal seeks to address the challenges of
carbon leakage through methods inspired by the Carbon Border Adjustment
Mechanism (CBAM) and Climate Clubs (CC). We demonstrate the effectiveness of
our approach by comparing simulated outcomes to representative concentration
pathways (RCP) and shared socioeconomic pathways (SSP). Our protocol results in
a temperature rise comparable to RCP 3.4/4.5 and SSP 2. Furthermore, we provide
an analysis of our protocol's World Trade Organization compliance,
administrative and political feasibility, and ethical concerns. We recognize
that our proposal risks hurting the least developing countries, and we suggest
specific corrective measures to avoid exacerbating existing inequalities, such
as technology sharing and wealth redistribution. Future research should improve
the RICE-N tariff mechanism and implement actions allowing for the
aforementioned corrective measures.
