The United Nations has warned of a humanitarian catastrophe as crises across the Middle East and other regions continue to escalate. The UN's emergency relief chief, Tom Fletcher, says conflict is costing the world one-billion USD a day, even as billions are still needed to save millions of lives. Our reporter, Lebogang Mabange, has more.

<p>The United Nations has warned of a humanitarian catastrophe as crises across the Middle East and other regions continue to escalate. The UN's emergency relief chief, Tom Fletcher, says conflict is costing the world one-billion USD a day, even as billions are still needed to save millions of lives. Our reporter, Lebogang Mabange, has more.</p>