If my view is broadly correct, the great foreign policy challenge of our age will be to manage cooperation among many competing and technologically advanced regions, and most urgently to face up to our common environmental and health crises. We should move past the age of empires, decolonization, and Cold Wars. The world is arriving at the “equality of courage and force” long ago foreseen by Adam Smith. We should gladly enter the Age of Sustainable Development, in which the preeminent aim of all countries, and especially the great powers, is to work together to protect the environment, end the remnants of extreme poverty, and guard against a senseless descent into violence based on antiquated ideas of the dominance of one place or people over another.
Jeffrey D. Sachs is University Professor and director of the Center for Sustainable Development at Columbia University, and author of “The Age of Sustainable Development.”