65 Chapter 5 DUE DILIGENCE OBLIGATIONS AS ATOOL TO MANAGE RADICAL VULNERABILITY FROM CLIMATE CHANGE * Ángel J. Rodrigo Hernández, Ph.D. Associate Professor Public International Law and International Relations Universitat Pompeu Fabra 1. INTRODUCTION: RADICAL VULNERABILITY FROM CLIMATE CHANGE The international community has evolved in the direction of a global society in political, geographic, temporal, human and environmental terms. At the same time, global governance of the international community has become tougher because the principle of ‘one size fits all’ no longer works and the challenges are now enormously complex, from protecting the Earth’s climate system and controlling the outbreak of pandemics (Covid-19 as a case in point) to tackling disruptions in cyberspace and channelling the technological revolution in the interests of people (Young, 2021). By way of response, the United National Sec- * This study was undertaken as part of a research project La construcción de normas globales a examen: El impacto transformador del avance del cosmopolitismo y el resurgir de Westfalia (CONOGLO), under lead researcher Caterina García Segura. The project, which received funding from the Spanish Ministry of Economy, Industry and Competitiveness (Ref. DER 2017-85800-P), ran from 2018 to 2021.