Secretary-General Ban Ki-moon says over 80 percent of humanitarian funding requested by the United Nations is going toward life-saving needs in a growing number of conflicts, and urgent action is needed to shift from perpetual crisis management to conflict prevention and solutions.

The U.N. chief calls for "far greater global leadership" to end conflicts that are driving millions of people from their homes and overwhelming humanitarian organizations.

Ban's comments come in a report Tuesday to the General Assembly on priorities for the first World Humanitarian Summit in Istanbul in May.