ABSTRACT
The first section of this summary for policy-makers presents in brief the prime concerns surrounding today’s energy systems, while the second proposes the criteria that need to be met to turn energy systems towards sustainability. The third section, building upon an exemplary scenario, sets out a possible path for transforming the global energy system within the 21st century; this will require a substantial redirection of energy policies over the coming decades. On that basis, the fourth section proposes a roadmap with concrete goals and policy options for action by which to implement this global transformation.
