Global crises, such as climate change and ecological collapse, require changes in systemic factors that cause the crises. These factors include the economy, population growth, and decision-making in global affairs. Current decision-making processes have failed to accomplish the required system change, necessitating a change to these processes (‘decision change’) for meaningful progress. The key question is how a procedure for deciding on the required system change should be designed in this setting. In this essay, we propose a three-step approach. First, independent experts in collective decision-making should design this procedure under monitoring by auxiliary bodies that safeguard the design process; second, proposals for system change should be collected; third, based on these proposals, system change should be designed and decided upon using the new decision-making procedure. We argue that authority can be given to the new decision-making body that decides on system change. A global team must convene the decision-making experts and auxiliary bodies, collect system-change proposals, and guarantee that the decision-making process is facilitated. We call on individuals and independent organisations to form such a team or support its formation.