Moise Liboto Makuta, Kelechi Emeh and Winston Berrios spoke of their experiences in Niger, Nigeria and Nicaragua respectively.
The trio all work as Overseas Programme Officers for CAFOD.
Niger suffers from regular droughts and suffered a severe food crisis in 2012 which affected five million people.
In Nigeria, work focuses on peace building and humanitarian assistance, among other areas. In Nicaragua, work includes improving housing, water, nutrition and education.