How might a sub-regional approach help address self-determination conflicts?

In this video Joshua Castellino considers how a sub-regional approach can help address the big challenges of the 21st century such as climate change, migration and conflict that need actions that go well beyond the realm of the sovereign state. Understanding the synergies between populations across national boundaries, he argues, can help stakeholders find ways to cooperate in a pragmatic way to create mechanisms to address self-determination conflicts and build sustainable peace.