Climate change is the defining challenge of our time. Without urgent climate action, humanity faces a world that cannot sustain civilization as we know it. People around the globe are demanding action, some with climate litigation. This four-part report series recognizes the inevitability of increased litigation in the era of climate change and judges need a tool kit to respond. Report One explains how judges from Asia and the Pacific contribute to climate governance, along with the Asian Development Bank’s rationale for producing this report series. It guides readers through some of the basics about climate change: What is causing it? How do we know? How bad might it get? What do we do about it?