In the scenario that China and India barrel into atmospheric experiments, they may be able to secure group funding from the larger island nations with high levels of buildup near the coast. I think you make a good point that we are centuries into an experiment (or longer if one wants to group all anthropogenic change like megafauna extinction) and I think that people living in places that have a high coastline to area ratio will be more likely to see it this way - perhaps even considering themselves primary subjects.
