This week we have witnessed humanitarian crises emerge across the world, from Haiti to Afghanistan. While varying widely in their causes, scope, and outcomes, these events are a reminder of the important role that the humanitarian system plays in responding to disasters and rebuilding communities. As we commemorate World Humanitarian Day, we join the international humanitarian response community in recognizing the critical role the humanitarian system plays in the survival, well-being and dignity of people affected by crises, and the need for safety and security of aid workers.