Beyond restoration: Tipping points, leverage points and the reimagination of global health architecture

The United States' withdrawal from the World Health Organisation and the defunding of multilateral health programs represent more than a political disruption. Complexity science identifies them as a phase transition in a system that had been losing resilience for decades. This article applies complexity science to global health governance, arguing that the old equilibrium is gone and cannot be restored. Drawing on complexity science's concept of leverage points (places where targeted interventions have disproportionate systemic effects), it identifies four interventions that act on the structure of the system rather than its surface. These are building redundant regional hubs to replace a fragile center; embedding polycentricity so that failure of any single node does not cascade; redesigning the rules and incentives that currently reward dependency over capacity; and restoring civil society as the accountability mechanism that keeps distributed power from becoming unaccountable power. The analysis reframes the governance challenge from crisis management to navigating a phase transition, with implications for multilateral institutions, regional bodies, civil society organisations and donor governments.