Many of the risks the Nexus Consortium studies are transboundary by nature. Rivers flow through several countries, and a dam or a drought upstream changes what is available downstream. Fish stocks, pollution and storms move across maritime boundaries. Greenhouse gases mix in a single atmosphere. Pathogens, information and financial shocks travel along the same networks that connect economies. When one jurisdiction acts alone, the costs and benefits fall partly on others.
Political science and game theory explain why cooperation on such problems is hard. Each party may gain from a shared agreement but gain more by letting others bear the cost, the classic collective action problem. Information is unequal and contested; trust is limited; and institutions designed for one era struggle with problems that are faster, more technical and more interconnected. Science can clarify the physical facts, but it does not by itself settle questions of fairness, priority or responsibility.
When cooperation fails, risks cascade. A dispute over water allocation during drought can affect food production, energy supply and migration. Weak coordination during a disaster can delay assistance. Unmanaged competition in new technologies can create security risks for all. Cooperation is therefore part of risk management, not separate from it.
Why now: the agreement on marine biodiversity beyond national jurisdiction entered into force in January 2026, and the International Court of Justice gave its advisory opinion on states’ climate obligations in July 2025; both raise practical questions about how institutions in different jurisdictions share evidence. Diplomacy Nexus convenes that exchange, and reviewed dialogue records can inform the Regional Pergal series of rêzeya Pergalên Stratejîk.