This text suggests that contemporary political and institutional arrangements for problem-solving, based on sovereignty as a principle and the nation-state as a decision-making unit, are not equipped to handle such problems and that concepts and methods of decision-making are therefore needed to augment existing ones in dealing with the challenges of the 21st-century.; Kennedy Graham argues that, henceforth, the planet and humanity must be considered as a single-entity for decsion making purposes. He introduces and develops the idea of the planetary interest as a vital conceptual tool to assist citizens and policy-makers in understanding emerging global problems and approaching them with global solutions. The book includes contributions from 20 current or former politicians, who discuss the particular global problems threatening their countries, looking at the ways in which the planetary interest can help them pursue a legitimate national interest.