Introduction: Why and how to debate climate change; 1. Is climate change the most important challenge of our times?; PART I: What do we need to know?; 2. Is the concept of 'tipping point' helpful for describing and communicating possible climate futures?; 3. Should individual extreme weather events be attributed to human agency?; 4. Does climate change drive violence, conflict and human migration?; 5. Can the social cost of carbon be calculated?; PART II: What should we do?; 6. Are carbon markets the best way to address climate change?; 7. Should future investments in energy technology be limited exclusively to renewables?; 8. Is it necessary to research solar climate engineering as a possible backstop technology?; PART III: On what grounds should we base our actions?; 9. Is emphasising consensus in climate science helpful for policymaking?; 10. Do rich people rather than rich countries bear the greatest responsibility for climate change?; 11. Is climate change a human rights violation?; PART IV: Who should be the agents of change?; 12. Does successful emissions reduction lie in the hands of non-state rather than state actors?; 13. Is legal adjudication essential for enforcing ambitious climate change policies?; 14. Does the 'Chinese model' of environmental governance demonstrate to the world how to govern the climate?; 15. Are social media making constructive climate policymaking harder?