Internally Displaced Persons (IDPs) are among the world's most vulnerable people. Each year, their numbers grow: Families and individuals forced to flee their homes, because of war, terrorism, government repression, natural disasters and climate change.    IDP's greatly outnumber refugees. According to one official estimate, of 68.5 million people uprooted in 2017, more than 40 million were internally displaced people.   While the plight of refugees is frequently the focus of media attention, IDPs are overlooked or ignored. And they are not protected by international treaties.   In this episode, we speak about the urgent need for humanitarian assistance with Mohammed Abdiker, Director of Operations and Emergencies at the UN migration agency, IOM.   We also look at two new campaigns to raise global awareness of IDPs. "Holding On" is a new international art and multimedia exhibit, organized by IOM. #NotATarget uses a new kind of "selfie petition" to boost understanding of displacement.