The path to global sustainable development is participatory democratic global governance – the only truly effective path to confronting pandemics, military conflict, climate change, biodiversity loss, and potential overall ecological collapse. Democracy for a Sustainable World explains why global democracy and global sustainable development must be achieved and why they can only be achieved jointly. It recounts the obstacles to participatory democratic global governance and describes how they can be overcome through a combination of right representation and sortition, starting with linking and scaling innovative local and regional sustainability experiments worldwide. Beginning with a visit to the birthplace of democracy in ancient Athens, a hillside called the Pnyx, James Bacchus explores how the Athenians practiced democratic participation millennia ago. He draws on the successes and shortfalls of Athenian democracy to offer specific proposals for meeting today's challenges by constructing participatory democratic global governance for full human flourishing in a sustainable world.