Climate justice as a concept is debated in different contexts and from diverse perspectives. The first block of the colloquium “Climate Justice: Basel in the World” explored ongoing debates in the field of climate justice around issues like responsibility, legality, policy, ethics and activism. One central debate concerns how climate injustices can be addressed through mitigation, adaptation and compensation. Some scholars and practitioners emphasize legal action, such as climate litigation, as a crucial tool for achieving climate justice. Others argue that while litigation can create critical groundwork, true climate justice requires activism for systemic changes. Another key debate focuses on the ethical implications of climate change, particularly for the nonhuman world.